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Visualizing video at the speed of light — one trillion frames per second
 
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MIT Media Lab researchers have created a new imaging system that can acquire visual data at a rate of one trillion frames per second. That's fast enough to produce a slow-motion video of light traveling through objects. Video: Melanie Gonick/MIT Read more: http://web.mit.edu/newsoffice/2011/trillion-fps-camera-1213.html Project website: http://www.media.mit.edu/~raskar/trillionfps/ Follow us on Twitter: http://twitter.com/mitnews
Interesting Facts About The Speed of Light
 
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*Subscribe: http://goo.gl/dgHQSp The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second. #sciencetoday #Facts #SpeedofLight FAIR-USE COPYRIGHT DISCLAIMER * Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, commenting, news reporting, teaching, scholarship, and research. - This video has no negative impact on the original works - This video is also for research and commenting purposes. - It is not transformative in nature. - we only used bits and pieces of videos to get the point across where necessary. If you have any issues with our "Fair Use", please contact us directly, for an amicable and immediate attention. [email protected] Thank you in advance for your understanding and cooperation.
Views: 609790 SCITODAY
How Fast Is Light?
 
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Light goes so fast that it broke our classical understanding of how speed works. We can fix our understanding with a little relativity and a space-time diagram, but you have to let go of any preconceived notions you might have about motion. ________________________________ VIDEO ANNOTATIONS/CARDS Complete Twins Paradox: https://youtu.be/UInlBJ4UnoQ Ultimate Guide to Relativity: https://youtu.be/FdWMM6aXpYE What Are Gravitational Waves? https://youtu.be/HmiPDvz0WVU What the HECK is a Photon?! https://youtu.be/73XdlgzSKws ________________________________ RELATED YOUTUBE VIDEOS PBS Space Time on Galaxy Collision: https://youtu.be/_P1xKh_kZFU ________________________________ HUGE THANK YOU TO THESE PATRONS ** Daniel Bahr, Ilya Yashin, Drake Dragon (TMDrake), Morgan Williams, Rick Finn, Kevin MacLean, David Bronakowski, Robert J Zapolis, Nicholas Ursa, Evgeny Ivanov ** ________________________________ SUPPORT THE SCIENCE ASYLUM Patreon: http://www.patreon.com/ScienceAsylum Advanced Theoretical Physics (eBook): https://gumroad.com/l/ubSc Merchandise: http://shop.spreadshirt.com/scienceasylum/ ________________________________ OTHER SOURCES https://www.jpl.nasa.gov/infographics/infographic.view.php?id=11489 https://home.cern/about/updates/2015/04/first-successful-beam-record-energy-65-tev https://physics.stackexchange.com/questions/43404/minkowski-diagram-hyperbola-and-invariant-quantity-of-relativity ________________________________ LINKS TO COMMENTS MusicalRaichu - Featured Comment: https://www.youtube.com/watch?v=UInlBJ4UnoQ&lc=UgyxXoFooiHYw1ghzIZ4AaABAg IoDavide1 - Featured Comment: https://www.youtube.com/watch?v=UInlBJ4UnoQ&lc=UgzyhI0A2-hn9BTq1YJ4AaABAg ________________________________ IMAGE CREDITS Juno Space Probe: https://commons.wikimedia.org/wiki/File:Juno_space_probe.jpg US Flag: https://commons.wikimedia.org/wiki/File:Flag_of_the_United_States.svg
Views: 69058 The Science Asylum
WHAT IF YOU TRAVELED AT THE SPEED OF LIGHT?
 
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Subscribe! Because SMART IS THE NEW SEXY: https://goo.gl/JTfP6L How long does it take to get to… Space trips are one of the popular human dreams. Imagine that human techonolgies allow us to move with the speed of light 186,282 miles per second. Where can we go and how fast. And “Smart is the new sexy” have found that information. Do you want to know it? So, sit down and listen. We start. Many thanks to Jared Owen and his video “How the Apollo spacecraft works”: https://youtu.be/8dpkmUjJ8xU (we use it on 4:47). His channel https://www.youtube.com/user/captainranic is great! ---------------------------------------------------------------------------------------- Our Social Media: Facebook: http://facebook.com/enjoy.science/ The Bright Side of Youtube: https://goo.gl/rQTJZz 5-Minute Crafts Youtube: https://www.goo.gl/8JVmuC ---------------------------------------------------------------------------------------- For more videos and articles visit: http://www.brightside.me/
Views: 1489361 SMART BANANA
Speed Comparison 2 : Faster than Light
 
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Part 3 is up, thanks for the wait! : https://www.youtube.com/watch?v=rIvRzvIE9Xc Features Comparisons: Race 7: Earth to Mars Light USCSS Prometheus (Prometheus) Fireball XL5 (Fireball XL5) USCSS Nostromo (Alien) Whorfin Spacecraft (Star Trek) The Ark (Transformers) D5 Battle Cruiser (Star Trek) The USS Sulaco (Aliens) USS Enterprise (Star Trek) Pillar of Autumm (Halo) Race 8: Earth to Pluto X10 Pillar of Autumm (Halo) USS Voyager (Star Trek) Nomad Probe (Star Trek) Borg Cube (Star Trek) Prawn Mothership (District 9) Karla Five Vessel (Star Trek) Eagle 5 (Space Balls) Ascendant Justice (Halo) Moya (Farscape) The GunStar (The Last Starfighter) Race 9: Earth to Alpha Centauri The GunStar (The Last Starfighter) The Rodger Young (Starship Troopers) Galactica BS-75 (Battlestar Galactica) Axiom (Wall-E) Imperial II-Class Star Destroyer (Star Wars) Trimaxion Drone Ship (Flight of the Navigator) Samus Gunship (Metroid) Millenium Falcon (Star Wars) Bes'uliik Starfighter (Star Wars) Daedalus (Stargate) Fastest Animal Race - 100m: Hare Lion Horse Springbok Pronghorn Ostrich Cheetah King Cheetah Fastest Birds Race - 300m Grey-Headed Albatross Spur-Winged Goose Red-Breasted Merganser Eurasian Hobby Swift Gryfalcon Golden Eagle Peregrine Falcon Fastest Fishes Race - 100m: Great White Shark Blue Whale Killer Whale Bluefin Tuna Shortfin Mako Swordfish Sailfish Black Marlin Supercars Race - 1km Jaguar XJ220 McLaren F1 GTR Lamborghini Diablo Coatl Ferarri ZXX Evolution Saleen S7 Twin Turbo SSC Ultimate Aero TT Porsche 9FF GT9-VMAX Bugatti Veryon Supersport Hennessey Venom GT Koenigsegg One:1 Supersonic Planes Race, 3km Su-27SKM - Mach 2.35 F-111 Aardvark - Mach 2.4 F-15 Eagle - Mach 2.5 MiG-31 Foxbat - Mach 2.83 XB-70 Valkyrie - Mach 3 Bell X-2 Starbuster - Mach 3.19 MiG-25 Foxbat - Mach 3.2 Lockheed YF-12 - Mach 3.35 SR-71 Blackbird - Mach 3.5 X-15 - Mach 6.7 Race 10 - Earth to Andromeda Galaxy Garden Snail Light Daedalus (Stargate) Star Trek Top Speed (Star Trek) Star Wars Top Speed (Star Wars) Spaceball 1(Space Balls) Planet Express (Futurama) The Tardis (Dr Who) Flash (DC) Heart of Gold (Hitchhiker's Guide to the Galaxy) Note: Objects not drawn to scale. Objects are moving at their top speed without any acceleration forever. Sources: Interesting Article on spaceships top speed: https://www.fatwallet.com/blog/fastest-ship-in-the-universe/ (most of the research/credit comes from here) Warp Speed Calculator (http://www.anycalculator.com/warpcalculator.htm) http://memory-alpha.wikia.com/wiki/Warp_factor http://starwars.wikia.com/wiki/Hyperdrive/Legends http://memory-alpha.wikia.com/wiki/Maximum_warp http://www.migflug.com/jetflights/the-10-fastest-aircraft-in-the-world.html http://comicvine.gamespot.com/barry-allen/4005-22804/forums/flash-max-speed-704188/
Views: 13864359 Reigarw Comparisons
Light year, light second calculation explained!
 
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Light travels at a speed of 300,000 km/second. In this video we will learn how to calculate a light year. how to calculate light years how to calculate speed of light how to calculate distance between two points distance between earth and moon distance between earth and mars distance between earth and sun --- Click here if you want to subscribe https://www.youtube.com/user/TheRealSengupta
Views: 23233 Amit Sengupta
Light travels in a Straight Line : School Science Project
 
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Physics Experiment-Do It Yourself! A simple experiment with things at your home to prove light indeed travels in a straight line.
Views: 92369 ExamFear Education
Science Video for Kids: How Does Light Travel?
 
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Light travels in waves. Light rays cannot bend to go around something. The light rays are either reflected, absorbed, or refracted. Watch out this video to understand these terms in detail! #Education #Science #Kids Looking for more educational content? Check out our corresponding light quiz: http://www.turtlediary.com/quiz/light.html
Views: 312287 Turtlediary
3 Things 'Faster Than Light'
 
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These 3 things go "faster" than the speed of light. How's that even possible? Subscribe: http://www.youtube.com/channel/UCj1gf... ↓Want more info?↓ More about the experiment: Marissa Giustina’s research: http://arxiv.org/abs/1511.03190 Advanced scientific note about Doppler: If there is a light moving away from you at constant velocity in static flat (Minkowski) space-time, no matter how red it is, you will never conclude it is going faster than light. But, here I am discussing the conclusions one might come to if you mistakenly use Doppler in the context of the curved space-time of the universe (where there is expansion). Interpreting the huge redshift as a result of the doppler effect, could make one think that galaxies we see are moving away at speeds approaching light speed. And since what we are actually seeing is light from those galaxies from billions of years ago, and given that the universe is expanding, you might be tempted to say that they have since "accelerated" to faster than the speed of light. You might go further and say that there are more distant galaxies that we can't see which are moving away even faster. So you might conclude there are galaxies moving faster than light in the universe. But the redshift isn't from doppler and this "acceleration" of the expanding universe isn't actually causing a true increase in velocity. Sometimes astronomers do say there is a faster than light "recession speed" by pretending the expansion of the universe is causing distant galaxies to move away from each other at a corresponding velocity, but that's misleading. In general relativity, you can actually have an increase in space between objects without causing a corresponding increase in the relatives velocities of those objects. CREDITS: Host, Writer, Animator, Editor: Greg Kestin From the producers of PBS NOVA © WGBH Educational Foundation Funding provided by FQXi Special thanks: Marissa Giustina Nick Hutzler Julie Elksy Byron Drury Jacob Barandes Tyler Howe Lissy Herman Ari Daniel Lauren Aguirre Kristine Allington Allison Eck Anna Rotschild MEDIA CREDITS: Music provided by APM: Deep_Science_No-perc Mysteries_of_Science_B Dreaming_of_the_Stars_a Curiosity_Kills_the_Cat_2 Conundrum_a Images: Stars - Rene Barrios Earth - Eirika galaxy spiral (by coornio - diviantart) Squirrel with scissors - 60811670 - Dollarphotoclub Equations - 91613623 - Dollarphotoclub Maxresdefault - Sean Stewart Marissa Giustina - Lammerhuber Tangled cat - David Swayze Cat doll - Vicky Somma Stock footage: train-exits-tunnel - Pond5 Bin_pulsar_442 - Courtesy of Nasa Expanding in space (40294) - Courtesy of Nasa WMAP_archive - Courtesy of Nasa
Views: 1861686 What The Physics?!
'Sonic Boom' Of Light Captured For The First Time Ever
 
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Scientists used a camera that can capture 100 BILLION frames per second in a single exposure to capture a "sonic boom" of light! Was Einstein Wrong About The Speed Of Light? - https://youtu.be/klM4MutLG0k Sign Up For The Seeker Newsletter Here - http://bit.ly/1UO1PxI Read More: NASA Armstrong Fact Sheet: Sonic Booms https://www.nasa.gov/centers/armstrong/news/FactSheets/FS-016-DFRC.html "A sonic boom is the thunder-like noise a person on the ground hears when an aircraft or other type of aerospace vehicle flies overhead faster than the speed of sound or supersonic. Air reacts like a fluid to supersonic objects. As objects travel through the air, the air molecules are pushed aside with great force and this forms a shock wave much like a boat creates a bow wave. The bigger and heavier the aircraft, the more air it displaces." Ultrafast Camera Captures 'Sonic Booms' of Light for First Time http://www.livescience.com/57572-ultrafast-camera-captures-sonic-booms-of-light.html "Just as aircraft flying at supersonic speeds create cone-shaped sonic booms, pulses of light can leave behind cone-shaped wakes of light. Now, a superfast camera has captured the first-ever video of these events." Scientists Capture a "Sonic Boom" of Light http://www.smithsonianmag.com/smart-news/scientists-capture-sonic-boom-light-180961887/ "Choi reports that optical engineer Jinyang Liang and his colleagues fired a green laser through a tunnel filled with smoke from dry ice. The interior of the tunnel was surrounded by plates made of silicone rubber and aluminum oxide powder. The idea was that, since light travels at different rates through different materials, the plates would slow down the laser light, which leave a cone-shaped wake of light." ____________________ DNews is dedicated to satisfying your curiosity and to bringing you mind-bending stories & perspectives you won't find anywhere else! New videos daily. Watch More DNews on Seeker http://www.seeker.com/show/dnews/ Subscribe now! http://www.youtube.com/subscription_center?add_user=dnewschannel Seeker on Twitter http://twitter.com/seeker Trace Dominguez on Twitter https://twitter.com/tracedominguez DNews on Facebook https://facebook.com/DiscoveryNews DNews on Google+ https://plus.google.com/u/0/+dnews Seeker http://www.seeker.com/ Sign Up For The Seeker Newsletter Here: http://bit.ly/1UO1PxI Written By: Emily Calandrelli
Views: 798888 Seeker
Speed of Light: How Does Light Travel?
 
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Watch this video to learn more about the Speed of Light. See this and over 140+ engineering technology simulation videos at http://www.engineertech.org. Simulations provided free under a Department of Labor grant awarded Eastern Iowa Community Colleges. To learn more visit http://www.eicc.edu.
Energy & Electricity in Science : How Fast Does Light Travel?
 
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Light is a form of electromagnetic radiation, which always travels at a speed of 186,000 miles per second in a vacuum. Discover how light travels slower in transparent media with information from a science teacher in this free video on electromagnetic radiation and science lessons. Expert: Steve Jones Contact: www.marlixint.com Bio: Steve Jones is an experienced mathematics and science teacher. Filmmaker: Paul Volniansky
Views: 5392 eHow
Riding Light - Traversing the Solar System at the speed of light
 
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Ever imagined what it would be like to traverse the Solar System at the speed of light? This is a video which attempts to re-create the out-of-this world experience. The ultimate ride begins on the surface of the sun, hurling you outwards at 186,000 miles per second, past the orbiting planets, the asteroid belt, until finally the sun appears as a faint glimmer among a sea of other stars. Enjoy
Views: 543955 ogniank
Traveling the solar system of the speed of light | 3D 2019 🛸
 
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Light Speed : 299,792,458 M/S 300,000 KM/S 1,079,252,848 KM/H 670,616,629 MP/H RED SIDE SHOP STORE https://goo.gl/hVMWE9 MUSIC (3 Background Music Mixed By Me) 1-Give us Time - Dark Ambient Music (CO.AG Music) 2-Im walking through the dust - Dark Ambient Background Music(CO.AG Music) 3-Kevin MacLeod ~ The House of Leaves (EricArchive) WIKIPEDIA: The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second (approximately 300,000 km/s (186,000 mi/s). It is exact because by international agreement a metre is defined to be the length of the path travelled by light in vacuum during a time interval of 1/299792458 second. According to special relativity, c is the maximum speed at which all conventional matter and hence all known forms of information in the universe can travel. Though this speed is most commonly associated with light, it is in fact the speed at which all massless particles and changes of the associated fields travel in vacuum (including electromagnetic radiation and gravitational waves). Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. In the special and general theories of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2. The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of electromagnetic waves in wire cables is slower than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200,000 km/s (124,000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 299,700 km/s (186,220 mi/s), which is about 90 km/s (56 mi/s) slower than c. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. In communicating with distant space probes, it can take minutes to hours for a message to get from Earth to the spacecraft, or vice versa. The light seen from stars left them many years ago, allowing the study of the history of the universe by looking at distant objects. The finite speed of light also limits the theoretical maximum speed of computers, since information must be sent within the computer from chip to chip. The speed of light can be used with time of flight measurements to measure large distances to high precision. Ole Rømer first demonstrated in 1676 that light travels at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. In 1865, James Clerk Maxwell proposed that light was an electromagnetic wave, and therefore travelled at the speed c appearing in his theory of electromagnetism.[5] In 1905, Albert Einstein postulated that the speed of light c with respect to any inertial frame is a constant and is independent of the motion of the light source.[6] He explored the consequences of that postulate by deriving the theory of relativity and in doing so showed that the parameter c had relevance outside of the context of light and electromagnetism. After centuries of increasingly precise measurements, in 1975 the speed of light was known to be 299792458 m/s (983571056 ft/s; 186282.397 mi/s) with a measurement uncertainty of 4 parts per billion. In 1983, the metre was redefined in the International System of Units (SI) as the distance travelled by light in vacuum in 1/299792458 of a second. Follow! FB : https://www.facebook.com/redsidefanpage Insta: https://www.instagram.com/redside_channel/
Views: 23999 RED SIDE
At the speed of light, what would you see?
 
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The Universe from light's point of view.
What If You Traveled Faster Than The Speed Of Light?
 
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The speed of light might seem fast, but what if you went faster than it? Download the new FireFox here: https://mzl.la/lifenoggin Subscribe: https://bit.ly/SubLifeNoggin | Get your exclusive Life Noggin merch: http://keeponthinking.co Support Life Noggin on Patreon: https://patreon.com/LifeNogginStudios Follow Life Noggin! Facebook: https://facebook.com/LifeNoggin/?ref=br_rs Instagram: https://instagram.com/lifenoggin/ Twitter: https://twitter.com/lifenoggin Official Website: https://lnstudios.co/ Watch More Life Noggin: Latest Uploads: https://youtube.com/watch?v=4A6XkYpmidU&list=PL8L0MzSk_V6JtEDRfRMyb6rFd1acqYSlO Big Questions: https://youtube.com/watch?v=rJTkHGXMdb0&list=PL8L0MzSk_V6LtaKh-Eqj7Cs4Tmf5iQPx4 Outer Space: https://youtube.com/watch?v=rJTkHGXMdb0&list=PL8L0MzSk_V6IPWXQvW3Exk9bqGzOdj8Qq Inside the Human Body: https://youtube.com/watch?v=FVnnM6hZ7Wk&list=PL8L0MzSk_V6JoZQ-Sy3eK2rjiDsamxCQs Popular Videos: https://youtube.com/watch?v=1bVfzBD-40E&list=PL8L0MzSk_V6IYeU-cNGR6NYHW19GMiPNy We are LIFE NOGGIN! An animated and educational web show designed to teach you all about your awesome life and the brain that makes you able to live it! We answer questions about everything from inside the human body to deep outer space. Stay tuned for more videos on every Monday and Thursday! Keep On Thinking. Life Noggin Team: Director/Voice: http://lifenogg.in/PatGraziosi Executive Producer - Ian Dokie: http://instagram.com/iandokie Director of Marketing: http://lifenogg.in/JaredOban Animation by Robert Grisham Written by Michael Sago: https://twitter.com/MichaelSago Sources: ftp://umpgal.gsfc.nasa.gov/pub/daac_ozone/Lecture4/Text/X/whatislight.html https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/how_fast_is_the_speed.htm https://www.space.com/37244-why-is-the-speed-of-light-so-slow.html http://www.bbc.com/news/uk-scotland-glasgow-west-30944584 http://micro.magnet.fsu.edu/primer/java/speedoflight/ http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html https://www.youtube.com/watch?v=VNv0Yzk00qg https://www.britannica.com/science/Cherenkov-radiation https://www.scienceabc.com/pure-sciences/cherenkov-radiation-is-there-a-sonic-boom-equivalent-for-light.html http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/cherenkov.html https://www.space.com/24701-how-long-does-it-take-to-get-to-mars.html https://sservi.nasa.gov/articles/how-far-is-it-to-mars/ https://exoplanets.nasa.gov/trappist1/ https://www.space.com/35796-trappist-1-alien-planets-travel-time.html http://www.trappist.one/#about http://www.phy.olemiss.edu/HEP/QuarkNet/time.html https://www.britannica.com/science/time-dilation
Views: 1407066 Life Noggin
Speed of light through different materials
 
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"Nothing can travel faster than the speed of light." "Light always travels at the same speed." Have you heard these statements before? They are often quoted as results of Einstein's theory of relativity. Unfortunately, these statements are somewhat misleading. Let's add a few words to them to clarify. "Nothing can travel faster than the speed of light in a vacuum." "Light in a vacuum always travels at the same speed." Those additional three words in a vacuum are very important. A vacuum is a region with no matter in it. So a vacuum would not contain any dust particles (unlike a vacuum cleaner, which is generally full of dust particles). Light traveling through anything other than a perfect vacuum will scatter off off whatever particles exist, as illustrated below. In vacuum the speed of light is c = 2.99792458 x 108 m/s This vacuum speed of light, c, is what the statements from relativity describe. Whenever light is in a vacuum, its speed has that exact value, no matter who measures it. Even if the vacuum is inside a box in a rocket traveling away from earth, both an astronaut in the rocket and a hypothetical observer on earth will measure the speed of light moving through that box to be exactly c. No one will measure a faster speed. Indeed, c is the ultimate speed limit of the universe. That's not to say that nothing ever travels faster than light. As light travels through different materials, it scatters off of the molecules in the material and is slowed down. For some materials such as water, light will slow down more than electrons will. Thus an electron in water can travel faster than light in water. But nothing ever travels faster than c. The amount by which light slows in a given material is described by the index of refraction, n. The index of refraction of a material is defined by the speed of light in vacuum c divided by the speed of light through the material v: n = c/v The index of refraction of some common materials are given below. material n material n Vacuum 1 Crown Glass 1.52 Air 1.0003 Salt 1.54 Water 1.33 Asphalt 1.635 Ethyl Alcohol 1.36 Heavy Flint Glass 1.65 Fused Quartz 1.4585 Diamond 2.42 Whale Oil 1.460 Lead 2.6 Values of n come from the CRC Handbook of Chemistry and Physics The values of n depend somewhat on wavelength, but the dependence is not significant for most applications you will encounter in this course. Unless you are told otherwise, assume the index of refraction given you is appropriate for the wavelength of light you are considering. Those materials with large indices of refraction are called optically dense media. (A medium is just a fancy word for a type of material.) Materials with indices of refraction closer to one are called optically rare media. Being naturally lazy creatures, we generally drop the word "optical'' and talk about dense and rare materials. Just be careful not to confuse dense and rare in the optical context with mass density! Notice that the index of refraction of air differs from the index of refraction of vacuum by a very small amount. For applications with less than 5 digits of accuracy, the index of refraction of air is the same as that of vacuum, n= 1.000. You will probably not encounter a situation in which the differenc between air and vacuum matters, unless you plan a future in precise optics experimentation. Even though light slows down in matter, it still travels at an amazing speed, even through a dense material such as lead still travels at an amazing speed. (Although light does not travel far through lead before being absorbed, high-energy gamma rays can travel a centimeter or so through lead at the speed calculated here.) Using the definition of n, we can find the speed of light through lead: vlead = c/nlead= (2.99792458 x 108 m/s) /(2.6) = 1.2 x 108 m/s = 2.6 x 108miles per hour Even slowed by lead, light travels at a speed of 260 million miles per hour! That's more than 10,000 times the speed of the orbiting space shuttle. (According to a NASA site, the space shuttle travels 17,322 miles per hour when in orbit.)
Views: 9751 Hey! Its Proved!
What If You Run At The Speed of Light ?
 
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Views: 10313707 Meet Arnold
Light Speed or 186,000 Miles/Second Visualized (My) Low-Budget Style
 
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since the speed of light is equivalent to roughly 7 times around the world in one second, i thought this was a good example of what that would look like (give or take several millions of miles per hour). this is a scene from "superman: the move" when he gets a bit upset after lois dies. enjoy, or else!
Views: 1371 ScotSpeed
Light seconds, light years, light centuries: How to measure extreme distances - Yuan-Sen Ting
 
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View full lesson: http://ed.ted.com/lessons/how-do-we-measure-distances-in-space-yuan-sen-ting When we look at the sky, we have a flat, two-dimensional view. So how do astronomers figure the distances of stars and galaxies from Earth? Yuan-Sen Ting shows us how trigonometric parallaxes, standard candles and more help us determine the distance of objects several billion light years away from Earth. Lesson by Yuan-Sen Ting, animation by TED-Ed.
Views: 1061807 TED-Ed
How Many Seconds Does Light Travel In A Year?
 
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You start with the speed of light, which is about 186,000 miles per second. How fast does light travel in one year, and how is it calculated many seconds a year? Youtube. If you are wondering, there just about 31,500,000 seconds in a year, and if multiply this by 186,000 (the distance that light travels each second), get 5. Remember, this is when the planets are closest to one another. Html "imx0m" url? Q webcache. If you could travel at the speed of light, circle globe earth almost eight times in one second 28 aug 2017 how can we comprehend distances to stars? This post explains light years terms a scale miles and kilometers. Any other time it will take even in the first problem you can see that multiplying by a positive power of ten indicates how many decimal places to right one must move point obtain normal light year is distance travels. In miles per hour, light speed is, well, a lot about 670,616,629 mph but i'll assume that you meant to ask how far does travel in one year. For example, the galaxy m109 is 27 oct 2015 rays of light that leave your screen when you start watching this video will go a long way before it finishes 23 aug as such, we measure cosmic distances according to how fast can travel in year. Googleusercontent search. Bbc earth how far does light travel in 60s? . Multiples of the light second can be defined, although apart from year they are more used in popular science publications than research works. Does light travel in 1 second? Quora how fast does travel? . 23 mar 2016 the speed of light is a constant. Nothing can travel faster than that. Stars other than our sun are so far 24 feb 2017 it was einstein who first demonstrated theoretically that light is the fastest thing in universe, travelling vacuum of space at a whopping 300,000km per second (or 186,000 miles second, depending on which side atlantic you stand). If light travels at a speed of 186,000 miles second how many are there in year? Does travel 1 second? Quora. What is a light year? Ucsb science linehomework #1 solutions. Light the average distance from earth to sun is 499. 4605 10^15 meters or 9,500,000,000,000 kilometers or 5,900,000,000,000 miles or 63,279 au. Think of it as you're using how long will take you to get there a substitute for far away are. (600,000,000 kilometers) (300,000 kilometers second)about 33 minutes. We can calculate this by multiplying the speed of light 1 year (or 3. The speed of light is roughly 300,000 kilometers per second 15 apr 2013 the short answer that it takes sunlight an average 8 minutes and 20 seconds to travel from sun earth. The speed of light space. The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers second), and theory nothing can travel faster than. For example, a light minute is 60 seconds and the average distance from earth to sun it really an incredibly long lightyear roughly 6 trillion miles or nearly 10 kilometers. Here's how you calculate it. Not only does it allow us therefore ligh
Views: 57 new sparky
Is Time Travel Possible?
 
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Is Time Travel Possible? Subscribe: https://goo.gl/GmtyPv Everyone has thought about time travel at least once in their life. Maybe you’ve wanted to go back in time and try to change something from your past. There’s even a lot of science fiction movies out there that involve time travel, or were inspired by time travel in some way or another. But is it really possible to travel back or forward in time? And if it really is possible, what would we have to do in order to make time travel a reality? The very thought about time travel and what it would take to make it a reality is mind-boggling. It is something that scientists, especially astrophysicists, have long thought about. The most fantastic thing? It's probably possible. We should probably start off with the bad news about time travel. We probably can’t travel back in time and watch the Egyptians build the pyramids. However, there are a number of theories that have suggested that it is possible to take a leap forward in time. But going back in time is far more complicated. That’s not saying it’s impossible though. The great 20th century scientist Albert Einstein developed a theory called Special Relativity. While most people think of time as a constant, Einstein showed that time is an illusion; it is relative in that it can vary for different observers depending on your speed through space. The ideas of Special Relativity are very hard to imagine because they aren't about what we experience in everyday life, but other scientists have confirmed this theory. The theory says that space and time are really aspects of the same thing which is called ‘space-time’. There is a speed limit of 300,000 kilometers per second (or 186,000 miles per second) for anything that travels through space-time, and light always travels this speed limit through empty space. So more about this illusion of time, ‘Special Relativity’ says that a surprising thing happens when you move through space-time, especially when your speed relative to other objects is close to the speed of light. Time goes slower for you than for the people you left behind. You won't notice this effect until you return to those stationary people. So as an experiment, let’s say you were 15 years old and you left Earth in a spacecraft traveling at about close to the speed of light, and you celebrated only five birthdays during your space voyage. When you got home at the age of 20, you would find that all your classmates who were the same age as you when you left were 65 years old, retired, and hanging out with their grandchildren! The reason for this is because as time passed more slowly for you, you would have experienced only five years of life, while your classmates will have experienced a full 50 years.
Views: 2649680 Unveiled
Light in Slow Motion
 
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From MIT: "MIT researchers have created a new imaging system that can acquire visual data at a rate of one trillion exposures per second. That's fast enough to produce a slow-motion video of a burst of light traveling the length of a one-liter bottle, bouncing off the cap and reflecting back to the bottle's bottom." "The pulse of light is less than a millimeter long. Between each frame, the pulse travels less than half a millimeter. Light travels a foot in a nanosecond and the duration of travel through a one foot long bottle is barely one nanosecond (one billionth of a second)." For more info and videos see the MIT trillion-frame-per-second video project website: http://web.media.mit.edu/~raskar/trillionfps/
Views: 220161 ronnievalencia
Light की Speed तक पहंचने की कोशिश| Nasa and Stephen Hawking want to send tiny spacecraft to Alpha
 
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Research Tv India #interstellartravelproject #starship #stephenhawking #secondearth #alphacentauri NASA's working on a nano-starship that travels at 1/5 the speed of light Stephen Hawking working on spacecraft that could reach ‘Second Earth’ in 20 years FOLLOW US ◆Facebook - https://www.facebook.com/researchtvindia/ ◆Twitter - https://twitter.com/researchtvindia ◆Instagram- https://www.instagram.com/researchtvindia/ ◆LinkedIn- https://www.linkedin.com/in/researchtvindia/ ◆Youtube- http://www.youtube.com/c/ResearchTvIndia Music: Heart of Nowhere Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/ Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.
Views: 439254 Research Tv India
Light Speed Travel Visualized
 
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Hello and welcome to What Da Math! In this video, we will talk about the speed of light. Patreon page: https://www.patreon.com/user?u=2318196&ty=h Enjoy and please subscribe. Other videos here: https://www.youtube.com/playlist?list=PL9hNFus3sjE7jgrGJYkZeTpR7lnyVAk-x Twitter: https://twitter.com/WhatDaMath Facebook: https://www.facebook.com/whatdamath Twitch: http://www.twitch.tv/whatdamath The video introduction made by Daniel Bates His YouTube channel with more of his work is here: https://www.youtube.com/mroutrochannel The new music theme made by Bogdan Bratis Check out his work here: http://www.bratis.uk/
Views: 189882 Anton Petrov
Sound & Light Travel in Waves
 
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This video is about Sound & Light Travel in Waves
Views: 11848 George Mehler
Speed of light around Earth, 7.5 laps per second
 
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If you could make light bend around Earth, it would orbit 7.5 times per second (near the surface). That's 0.13 seconds per orbit! Play around with the SPEED in settings, as I uploaded this at 60 frames per second. *Animation by Dr. James O'Donoghue using NASA imagery. *Share/use as you wish, credit is appreciated.
Views: 716639 Dr James O'Donoghue
How Many Seconds Does Light Travel In A Year?
 
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The speed of light space 15830. In one second, light travels exactly 299,792,458 meters (in a vacuum), by definition what would happen if i could travel at 1 lightyear per second? If speed of for distance year, how much will age in that duration? . Here's how you calculate it. Apr 15, 2013 photons emitted from the surface of sun need to travel there are galaxies millions light years away, which means we're earth sun! problem 1 travels at a speed 300,000 km sec. Why does r i meters per second. A light second is the distance travels in one second, or 7. If you could travel at the speed of light, go around earth 7. In order to calculate apr 24, 2017 astronomers define a light year as the distance travels in one. How far does light travel in a year? Universe today. What is a light year and how long 1 year? Physlink. And why? There is not much to collide with in empty space, so light travels fastest space. Html url? Q webcache. Times is of objects transmitted that light a million or more years long!. How far does light travel in 1 second? Quora. Here is an article on the speed of light and years doing math, a year 9. From earth to the sun! problem 1 light travels at a speed of 300,000 km sec. How long does it take sunlight to reach the earth? Phys. Googleusercontent search. Exploring the stars in orion light year madness!how long does it take for from sun travel to earth exploring madness! space math scientific notation and speed of radio jove. How long does it take light to travel a) the moon at a distance of 380,000 km? . May 22, 2012 the speed of light in a vacuum is 186,282 miles per second (299,792 kilometers second), and theory nothing can travel faster than. Then you multiply that by 3,600 seconds in an hour if were traveling at the speed of light could fly around world 7 and a half times we'll need to know circumference planet earth how far travels second. How far can light travel in one year and why? Quora. We can calculate this by multiplying the speed of light 1 year (or 3. The speed of light space. You start with the speed of light, which is about 186,000 miles per second. How fast does light travel? . In miles per hour, light speed is, well, a lot about 670,616,629 mph. The standard symbol for the speed of light is c, so we can write example problem how long does it take radio waves to travel from earth moon, a 1 day ago he did this by relating year astronomical unit sun distance. Light can travel at a speed of 300,000 km (186,000 miles) second. That means that in one let's see how many light minutes earth is from the sunDoes travel? . How far is a light year? Light distance to jupiter. Bbc earth how far does light travel in 60s? . Light distance (or radio distance) to jupiter light travels at 300,000 kilometers sec. 1557 10^7 seconds) to it really is an incredibly long distance a lightyear is roughly 6 trillion miles or nearly 10 trillion kilometers. Science on the brain how far is a lightyear? Marshall. It is defined as the distance tha
Views: 197 Put Put 1
Why can't you go faster than light?
 
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One of the most counterintuitive facts of our universe is that you can’t go faster than the speed of light. From this single observation arise all of the mind-bending behaviors of special relativity. But why is this so? In this in-depth video, Fermilab’s Dr. Don Lincoln explains the real reason that you can’t go faster than the speed of light. It will blow your mind.
Views: 2273843 Fermilab
Why does light slow down in water?
 
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There are many mysteries of physics for which you can find explanations online and some of those explanations are wrong. In this video, Fermilab’s Dr. Don Lincoln takes on the mystery of why light travels slower in water and glass. He lists a few wrong explanations and then shows you the real reason this happens.
Views: 247644 Fermilab
Light Speed Travel
 
24:27
The speed of light is more of a hot topic than ever nowadays. It is the speed at which photons travel in a vacuum- and is the fastest speed achievable within the universe. As creatures of exploration and innovation, understanding light speed has naturally led us on a quest to try and determine a method with which we can reach it, and eventually one day exceed it. Si-Fi fantasy or not, a galaxy of the Milky Way’s vastness would require such speeds to make exploring it somewhat of a possibility for a race such as humanity’s. But there are some drawbacks. The difficulty of developing light speed travel, or propulsion systems that could travel at a high percentage of it, is enormous- and may be impossible altogether. Furthermore, our current understanding of physics suggests that were you to travel at this immense speed, you would be making more of a sacrifice than you first anticipate, as light and time go hand in hand at the limit of possibility. Nonetheless, we are investing, investigating and innovating, and examining the skies and the stars, as we search for a way to travel at the ultimate speed of light… Want more videos? Click here to subscribe: https://www.youtube.com/sea1997?sub_confirmation=1 Join the NEW, OFFICIAL PARTNER #SeaSquad 100K Discord Server! https://discord.gg/SEA MUSIC: - CO.AG: https://www.youtube.com/channel/UCcavSftXHgxLBWwLDm_bNvA - Chris Zarbriskie: https://soundcloud.com/chriszabriskie FOOTAGE: - A Space Journey (8m Exhibition): https://www.youtube.com/watch?v=Un5SEJ8MyPc - Green Nebula Fly-By: https://www.youtube.com/watch?v=JbC6KVzn-m0 - Blue Nebula Fly-Through: https://www.youtube.com/watch?v=EaM9kDPa_AY - Spinning Galaxy Loop: https://www.youtube.com/watch?v=7NyEX8DjOTw - 4K Nebula Eye Scene: https://www.youtube.com/watch?v=eKqc7xdrx5E&t - 1-Minute Galaxy Zoom: https://www.youtube.com/watch?v=XuVyYbXjeQ0 - Satellite Dish: https://www.videezy.com/members/beachfront - Provided by Beachfront under a Creative Commons license - Particles: https://www.youtube.com/watch?v=G_Q6I7nj23A - Provided by RoyaltyFreeTube under a Creative Commons License - Rocket Blast Off: https://www.youtube.com/watch?v=BKX-1G-zuUQ - Nebula Space Scene: https://www.youtube.com/watch?v=eoEVCau7hio - Provided by RoyaltyFreeTube under a Creative Commons License - Void / Dust Footage: https://www.youtube.com/watch?v=Nw6Y5RldX9I Remaining outstanding footage provided by Videezy.com - Popular Playlists! - • Creepy Playlist: https://goo.gl/Gxoqyy • Out of this World: https://goo.gl/AV9ePP • Conspiracy Cases: https://goo.gl/mqmF6P • G-News: https://goo.gl/17K9yu - Out of this World - • The Fermi Paradox: https://youtu.be/lFypvFYO7LQ • The Cold Spot: https://youtu.be/PQHhLHh_8go • Bootes Void: https://youtu.be/SPtSBLpyBu4 - Conspiracy Cases - • 11B-X-1371 Mystery: https://youtu.be/FK314DWnPGs • Dyatlov Pass Incident: https://youtu.be/zkdAUESx7Vk • Denver Airport Conspiracy: https://youtu.be/mUKHMGDe6-w - GD - • G-NEWS: https://goo.gl/17K9yu • "The Best Of" Lists: https://goo.gl/412EaD • Community Commentary: https://goo.gl/tgJvPv • Full GD Playlist: https://goo.gl/dWkXfo - Maps From Hell Series - • Bloodlust Episode: https://youtu.be/W1D2Dxvi0cg • Yatagarasu Episode: https://youtu.be/mmi8db-JV2E • Plasma Pulse Series Episode: https://youtu.be/-plAW84qvB4
Views: 74109 SEA
Light travels in a straight line? (Let's find out)
 
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An experiment using a tank of water with added milk powder to act as a diffuser to find out how light travels. Demonstrations include a krypton torch (yellow light), an LED torch (white light) and a laser light., (The video is made to illustrate that light travels in a straight line for primary school students.)
Views: 58766 SG Primary Science
How to Freeze Light | Sci Guide | Martin Archer | Headsqueeze
 
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Martin explains how we can freeze light inside crystals, stopping it in its tracks to perhaps one day create Superman-like information storage. Light travels at 299,792,458 metres per second when moving through a vacuum. Nothing can go faster than this, mainly due to weight as only mass-less photons can travel that fast. However if photons travel though a substance like water they slow down. That's why the bottom of swimming pools look closer than they are. Researchers in Germany have recently been able to stop light moving for an entire minute at a time. An impressive feat, as in the space of a minute light would normally be able to travel the equivalent of 450 times around the Earth. In order to trap light, researchers used a crystal, two distinct lasers and praseodymium ions. The charged particles inside the crystal turn it opaque effectively prohibiting light to enter. By firing a laser beam at the crystal, a quantum effect takes place called 'electromagnetically induced transparency' and light of a certain colour can now enter. The second laser is then fired, of course it has the requisite colour and while it is passing through, the first laser is deactivated, the crystal turns opaque again and the light from the second laser is trapped inside. The slowed light trapped inside the crystal is effectively no longer light, it's a spin wave. The praseodymium ions have a property known as spin due to the electrons orbiting around their nuclei and they create the wave. However the light can be retrieved in its original state. It retains its quantum coherence giving rise to the possibility that it could be used to store information. Just imagine, HeadSqueeze videos of the future stored inside crystals then accessed at super fast-speeds. Superman's Kryptonian crystal palace awaits! If you liked this HeadSqueeze video, be sure to subscribe for more superhero science facts. Discuss freezing light with Martin and the gang in the comments and share us with your friends. Discover how the internet works , James May describes how the internet super highway works. http://youtu.be/C3sr7_0FyPA Are we close to building a real life Iron Man suit? Martin Archer battles with these new technologies. http://youtu.be/uMUDcWD0beY http://www.youtube.com/user/HeadsqueezeTV http://www.youtube.com/subscription_center?add_user=HeadsqueezeTV
Views: 35513 BBC Earth Lab
How long will it take to fly from earth to the end of the universe
 
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Special Thanks to: Izak Smit for the Music If you fly at the speed of light you will go around the earth 7.5 times in one second. If we maintain that same speed we can get to the moon in 1.3 seconds, and then we can go all the way to Mars in 4.2 minutes, just enough time to make some noodles and if you are fast a cup of tea. And if we carry on through the asteroid belt maintaining our speed of 300 000 km per second we will reach the gas giant Jupiter in about 43 minutes, more than enough time to eat noodles drink tea and to play a few games of black jack. From here it will take us another 86min to get to Saturn, just enough time to watch the movie shrek. To fly from earth to the end of our solar system past pluto will take 4.5 Hours at the speed of light. That’s enough time to watch fellow ship of the ring and the two towers. We maintain this speed and it takes us 4 years to get to the closest star. 4 birthdays and 4 Christmas dinners, think of a job or something you have done every day for 4 years to get perspective of your time onboard this space ship. If we want to fly from the one end of the galaxy to the other end it would take 100 000 years, that means if people on this space ship grow to the age of 100 our flight time will take 1000 generations of people getting born and growing old on board this ship before we reach our destination. Finally we reach the end of our milky way after 100 000 years of flying at incredible speeds To get us to the next galaxy we have to fly for 2.5 million years at this speed we have to wait for another 25 thousand generations to come and go before we reach our destination. Now we will attempt our journey to the edge of the universe which will take 46 billion light years, so we will go through four hundred and sixty million generations of 100 year old people before we get there, at which point we could possibly discover a multiverse. Astronomers estfimate that the observable universe has more than 100 billion galaxies. Our own Milky Way is home to around 300 billion stars. There are more stars in our universe than grains of sand on all the beaches in the world and 75% of the stars in our galaxy have planets around them, and many are in the habital zone. Considering that a teaspoon of sand has more atoms than all the stars in the observable universe just imagine all the spontaneous chemical reactions happening with all the chemicals on all the planets surrounding all the stars and then consider that the building blocks for life such as amino acids and proteins can spontaneously form in certain environments, then one has to consider the possibility that life on other planets is mathematically inevitable.
Views: 396851 Mad Brain Lab
What Is The Speed of Dark?
 
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twitter: http://www.twitter.com/tweetsauce instagram: http://www.instagram.com/electricpants facebook: http://www.facebook.com/VsauceGaming SOURCES BELOW: this is the video where I talk about THE SPEED OF PUSH: https://www.youtube.com/watch?v=Do1lm9IevYE Big thanks to Martin Archer for help with this episode: http://www.martinarcher.co.uk/ And thanks to Guy Larsen for his shadow magic: https://twitter.com/guylar music by http://www.YouTube.com/JakeChudnow and http://www.audionetwork.com shadows faster than light: http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html#3 http://physics.stackexchange.com/questions/63434/could-the-shadow-move-with-faster-than-light-speed http://www.madsci.org/posts/archives/2000-02/950834634.Ph.q.html making the moon brighter: http://what-if.xkcd.com/13/ sunset and earth’s shadow and belt of venus in single pics: http://apod.nasa.gov/apod/ap131024.html http://apod.nasa.gov/apod/ap100729.html amounts of evening-types in a city: http://weatherspark.com/averages/33125/Honolulu-Hawaii-United-States superluminal scissors: http://math.ucr.edu/home/baez/physics/Relativity/SR/scissors.html http://boards.straightdope.com/sdmb/archive/index.php/t-69757.html wave animations: http://www.ablongman.com/mullin/AnimationPages/FigsI-19&20.html http://www.acs.psu.edu/drussell/Demos/SWR/SWR.html http://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-inter-superp.htm phase velocity vs. group velocity: http://resource.isvr.soton.ac.uk/spcg/tutorial/tutorial/Tutorial_files/Web-further-dispersive.htm faster than light dark patches: http://www.askamathematician.com/2013/02/q-is-darkness-a-wave-the-way-light-is-a-wave-what-is-the-speed-of-dark/ http://www.physicsclassroom.com/class/light/Lesson-3/The-Path-Difference make a light interference pattern at home: http://www.exploratorium.edu/snacks/diffraction/ http://www.instructables.com/id/How-to-perform-Interference-and-Diffranction-at-Ho/ the speed of ignorance: http://www.brainpickings.org/index.php/2012/04/02/stuart-firestein-ignorance-science/ http://philosophicalfallibilism.blogspot.com/2009_03_20_archive.html http://kk.org/thetechnium/2008/10/the-expansion-o/ http://louisecharente.wordpress.com/2013/10/24/the-discovery-of-ignorance/ Dunning-Kruger: http://www.huffingtonpost.com/david-macaray/the-dunningkruger-effect_b_4476166.html http://en.wikipedia.org/wiki/McArthur_Wheeler “animalcules”: http://www.leben.us/index.php/component/content/article/59-volume-3-issue-4/236-antoni-van-leeuwenhoeks-amazing-little-animalcules
Views: 13806266 Vsauce
Frequency, Wavelength, and the Speed of Light | a video course made easy by Crash Chemistry Academy
 
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This video describes what frequency is, how it is measured, how frequency and wavelength are related visually and mathematically, and derives the mathematical relationship between frequency, wavelength, and the speed of light CC Academy videos are easy 101 crash course tutorials for step by step Chemistry help on your chemistry homework, problems, and experiments. Check out our best lessons: - Solution Stoichiometry Tutorial: How to use Molarity - Stoichiometry - Quantum Numbers - Rutherford's Gold Foil Experiment, Explained - Covalent Bonding Tutorial: Covalent vs. Ionic bonds - Metallic Bonding and Metallic Properties Explained: Electron Sea Model - Effective Nuclear Charge, Shielding, and Periodic Properties - Electron Configuration Tutorial + How to Derive Configurations from Periodic Table - Orbitals, the Basics: Atomic Orbital Tutorial — probability, shapes, energy - Metric Prefix Conversions Tutorial - Gas Law Practice Problems: Boyle's Law, Charles Law, Gay Lussac's, Combined Gas Law —More on Light | Wiki— "Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.[1] Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).[2][3] This wavelength means a frequency range of roughly 430–750 terahertz (THz). The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey. The primary properties of visible light are intensity, propagation direction, frequency or wavelength spectrum, and polarization, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature. Visible light, as with all types of electromagnetic radiation (EMR), is experimentally found to always move at this speed in a vacuum.[citation needed] In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.[4][5] In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics." Wikipedia contributors. "Light." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 5 Jun. 2016. Web. 18 Jun. 2016.
Views: 157477 Crash Chemistry Academy
Light Is Waves: Crash Course Physics #39
 
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The way light behaves can seem very counter intuitive, and many physicists would agree with that, but once you figure out light waves it all starts to make more sense! In this episode of Crash Course Physics, Shini shows us how we know that light exists as a wave and why that's really cool! Want more Crash Course in person? We'll be at NerdCon: Nerdfighteria in Boston on February 25th and 26th! For more information, go to http://www.nerdconnerdfighteria.com/ *** Get your own Crash Course Physics mug from DFTBA: http://store.dftba.com/products/crash... The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list... -- Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashC... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 468829 CrashCourse
The Speed of Light is NOT About Light
 
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The Speed of Causality Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g The speed of light is often cited as the fastest anything can travel in our universe. While this might be true, the speed of light is the EFFECT and not the CAUSE of this phenomenon. So what's the cause? On this week's episode of Space Time, Matt helps explain what the speed of light REALLY is and why it’s the cosmic speed limit of our universe! "The Real Meaning of E=mc²": https://www.youtube.com/watch?v=Xo232kyTsO0 "Are Space And Time An Illusion?": https://www.youtube.com/watch?v=YycAzdtUIko ----------------------------------------­­--------- SOURCES: Einstein's derivation or the Lorentz transformation from the invariant speed of light: Einstein, Albert (1916) "Relativity: The Special and General Theory" http://www.archive.org/stream/cu31924011804774#page/n159/mode/2up Lorentz Transformation without invariant speed of light, from relativity, isotropy, and consistency of frame transitions (closure group postulate): von Ignatowsky, “Das Relativitatsprinzip,” Archiv der Mathematik und Physik 17, 1–24 (1911) Berzi1 & Gorini, J. Math. Phys. 10, 1518 (1969) http://dx.doi.org/10.1063/1.1665000 Pelissetto & Testa, American Journal of Physics, 83, 338, (2015) "Getting the Lorentz transformations without requiring an invariant speed" http://arxiv.org/abs/1504.02423 https://en.wikipedia.org/wiki/Derivations_of_the_Lorentz_transformations ----------------------------------------­­--------- COMMENTS: Denny Hiu https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z124w3dhotmtx34lk224wzxyhwqufdefe . (RadimaxRadimaX) https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z124xv145zzkzpiei233spnqjzraejjig04 Epsilon Lazerface https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z12fv5ejyzyyc1dbv04cgzhyxknfzdnjcao LassieDog999 https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z12zz13iezrqh142k23kitgxuqjqy35su Tenebrae https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z134yj2pcvrkhnu4u04ccdxhuufvuvkomd0 ----------------------------------------­­--------- REFERENCES: Krauss & Scherrer 2007 http://arxiv.org/abs/0704.0221 Vardanyan, Trotta & Silk, 2011 http://arxiv.org/abs/1101.5476 ----------------------------------------­­--------- Let us know what topics you want to learn more about:http://bit.ly/spacetimepoll
Views: 3287145 PBS Space Time
WHY CAN NOTHING TRAVEL FASTER THAN THE SPEED OF LIGHT?
 
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Hi Everyone, today we’re exploring one of the fundamental characteristics of our Universe - that no particle can be made to travel faster than the speed of light in space. Why is that? TOPICS COVERED IN THIS VIDEO: Why light travels at light speed? - 0:13 What happens when we try to accelerate a particle to the speed of light? - 0:35 What is time dilation? - 0:57 What are Tachyons? - 2:37 What is the causality principle? - 3:16 What are wormholes? - 3:34 How fast does space expand? - 3:56 Quantum entanglement explained | Spooky action at a distance defined - 4:14 --------------------------------------------------------------------------------- BUY MY EDUCATIONAL EBOOKS - https://amzn.to/2T0Zb9W TITLES AVAILABLE String theory made simple Theory of relativity made simple Quantum Mechanics made simple The Fermi paradox --------------------------------------------------------------------------------- CONNECT WITH ME Instagram (see the girl behind the videos) - https://www.instagram.com/londoncitystyle/ --------------------------------------------------------------------------------- SUPPORT ME ON PATREON - https://www.patreon.com/londoncitygirl Even the smallest of amounts will help me create more and more content for YouTube and I’ll be forever grateful! :D --------------------------------------------------------------------------------- SUBSCRIBE TO MY VLOG CHANNEL https://www.youtube.com/channel/UC9FKi7qNrRXP8wbknC6c0BA?sub_confirmation=1 #Physics #TimeDilation #SpeedOfLight
How Far Does The Speed Of Light Travel In A Year?
 
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"How Far Does The Speed Of Light Travel In A Year? Watch more videos for more knowledge How Far Does The Speed Of Light Travel In A Year ... https://www.youtube.com/watch/lbkNO6fJ2ZM How Far Does The Speed Of Light Travel In A Year ... https://www.youtube.com/watch/oPh2fIJ7erc How Far Will Light From a Star Travel in One Year ... https://www.youtube.com/watch/hxjAON8x8HE Speed of Light: How Does Light Travel? - YouTube https://www.youtube.com/watch/plwgU5hoYmU How Far Can You Travel? Voyaging Billions of ... https://www.youtube.com/watch/4tjQ8o8j-O8 How Many Seconds Does Light Travel In A Year ... https://www.youtube.com/watch/KGzGi4tNDHU What If You Traveled Faster Than The Speed Of ... https://www.youtube.com/watch/FqnWEWYp9DU How Fast Does The Speed Of Light Travel? - YouTube https://www.youtube.com/watch/w--_447Pqig How far does light travel in one second - YouTube https://www.youtube.com/watch/8BPF_F0XcT4 How Fast Does The Speed Of Light Travel? - YouTube https://www.youtube.com/watch/8NPL0QPIrd4 How Many Seconds Does Light Travel In A Year ... https://www.youtube.com/watch/EfoTrCDdFxI Light year, light second calculation explained ... https://www.youtube.com/watch/Mxh0Eo1YQG4 NASA May Have Just Discovered Faster than Light ... https://www.youtube.com/watch/_BD-X6nWqcw What is the speed of light? - YouTube https://www.youtube.com/watch/2j6yV07vx9c Interstellar Travel: Approaching Light Speed - YouTube https://www.youtube.com/watch/c4z6RZXv5p8 Riding Light - Traversing the Solar System at the ... https://www.youtube.com/watch/1AAU_btBN7s Is Interstellar Travel Possible? (Time Dilation & The ... https://www.youtube.com/watch/RTn77uCYU_8 How to break the speed of light - YouTube https://www.youtube.com/watch/lR4tJr7sMPM Cosmic Queries - What is a Light Year? - YouTube https://www.youtube.com/watch/BCp5drCEGgg Can You Go the Speed of Light? - YouTube https://www.youtube.com/watch/vVKFBaaL4uM"
Views: 80 Put Put 1
Is Time Travel Really Possible?
 
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We've all wondered at some point whether time travel is actually possible like it is in the movies. Second Thought is here to find out! Time Dilation Calculator: http://www.emc2-explained.info/Dilation-Calc/#.WLIVUjsrKUk Sources and Further Reading: http://authors.library.caltech.edu/3737/ http://www.fourmilab.ch/cship/timedial.html http://www.hawking.org.uk/space-and-time-warps.html http://adsabs.harvard.edu/abs/2006FoPhL..19..259N http://physics.aps.org/story/v15/st11 https://www.researchgate.net/publication/260930585_ACS_Surgery_Principles_and_Practice_critical_care http://cshperspectives.cshlp.org/content/4/6/a005751.full.pdf Much of the research on paradoxes was compiled by one of my very helpful volunteers: Alan Le! Music: https://www.youtube.com/watch?v=zaLTikHtuHw Follow Second Thought on Social Media! Twitter: https://twitter.com/_SecondThought Facebook: https://www.facebook.com/secondthoughtchannel/ Join the official Discord server! https://discord.gg/5FTJz3W Support Second Thought on Patreon! https://www.patreon.com/secondthought
Views: 4229266 Second Thought
LIGHT SPEED IN HINDI || 1.5 सेकेंड मे चाँद पर || LIGHT SPEED TRAVEL IN HINDI || LIGHTING SPEED
 
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HELLO GUYS HOW R U ALL , IN THIS VIDEO IM TALK ABOUT SPEED OF LIGHT . #LIGHTSPEED #SPEEDOFLIGHT #TRAVELINGLIGHTSPEED The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second (approximately 300,000 km/s (186,000 mi/s)[Note 3]). It is exact because by international agreement a metre is defined to be the length of the path travelled by light in vacuum during a time interval of 1/299792458 second.[Note 4][3] According to special relativity, c is the maximum speed at which all conventional matter and hence all known forms of information in the universe can travel. Though this speed is most commonly associated with light, it is in fact the speed at which all massless particles and changes of the associated fields travel in vacuum (including electromagnetic radiation and gravitational waves). Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. In the special and general theories of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.[4] The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of electromagnetic waves in wire cables is slower than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200,000 km/s (124,000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 299,700 km/s (186,220 mi/s), which is about 90 km/s (56 mi/s) slower than c. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. In communicating with distant space probes, it can take minutes to hours for a message to get from Earth to the spacecraft, or vice versa. The light seen from stars left them many years ago, allowing the study of the history of the universe by looking at distant objects. The finite speed of light also limits the theoretical maximum speed of computers, since information must be sent within the computer from chip to chip. The speed of light can be used with time of flight measurements to measure large distances to high precision. Ole Rømer first demonstrated in 1676 that light travels at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. In 1865, James Clerk Maxwell proposed that light was an electromagnetic wave, and therefore travelled at the speed c appearing in his theory of electromagnetism.[5] In 1905, Albert Einstein postulated that the speed of light c with respect to any inertial frame is a constant and is independent of the motion of the light source. DONT FORGET HIT : L-I-K-E S-H-A-R-E S-U-B-S-C-R-I-B-E AFFILIATE LINKS : MY SET UP : MY PHONE : http://amzn.to/2n85SZR MY COMPUTER : http://amzn.to/2Gcqg4I FOR YOUTUBERS : BEST MIC FOR YOUTUBERS : http://amzn.to/2E3psyb BEST CAMERA FOR YOUTUBERS : http://amzn.to/2n7AF8K BEST LAPTOP FOR YOUTUBERS : http://amzn.to/2n3F78E SOCIAL LINKS : FACEBOOK : https://www.facebook.com/GuriKhindaOfficial INSTAGRAM : https://www.instagram.com/guri_khindaofficial CONTACT FOR SPONSORSHIP : [email protected] YOU SHOULD WATCH THIS : 11 . AMAZING PLANETS IN OUR UNIVERSE : https://www.youtube.com/watch?v=Melh9O6JId8 10 . AMAZING SCIENTIFIC FACTS ABOUT DREAMS : https://www.youtube.com/watch?v=46uryIo9aFo 9 . UY SCUTI BIGGEST STAR IN OUR UNIVERSE : https://www.youtube.com/watch?v=VXCQUSWS51A 8 . SCIENTIFIC FACTS ABOUT SLEEP POSOTION : https://www.youtube.com/watch?v=JmsnBd_STfg 7 . WHAT IF EARTH WERE HALF IN SIZE : https://www.youtube.com/watch?v=6gKfeKhnYTk 6 . AMAZING FACTS ABOUT EARTH : https://www.youtube.com/watch?v=aCs8xOh4nzY 5 . SCIENTIFIC FACTS ABOUT HUMAN BODY : https://www.youtube.com/watch?v=1qmIIXGvov4 4 . WHAT'S INSIDE THE EARTH : https://www.youtube.com/watch?v=b2wmXqscOO4 3 . INDIA IN 2050 , INDIA'S FUTURE : https://www.youtube.com/watch?v=BE-QyefiXcM&t=25s 2 . 10 SIGNS OF GENIUS , NORMAL VS GENIUS : https://www.youtube.com/watch?v=miuTX2FGOBw&t=25s 1 . WORLD IN 2050 , ADVANCED FUTURE TECHNOLOGY : https://www.youtube.com/watch?v=01go-Ojjcj8&t=1s MUSIC : BACKGROUND MUSIC : https://www.youtube.com/channel/UCHEi...
Views: 536 Tech Pro
Tachyons: Faster Than Light Particles
 
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Bonus Videos, "The Nature of Itself," & "Chemicals of Reality," Premium Videos Available @ http://www.patreon.com/strangemysteries Narrated by Jack Daniel www.jackdanielvo.com It is often said that nothing can travel faster than the speed of light. The universal speed limit is 299,792,458 metres or 300,000 kilometres per second, and due to the rules the flying spaghetti monster imposed upon the universe during its creation, this limit cannot be broken. Or can it? Theoretical physics describes a type of particle which may be able to break the light barrier. It can also reportedly travel through time, it gets faster as it loses energy and it possesses has negative mass. So does this mysterious particle really exist? The "Nature of Itself Trailer" Background Music: Seven Lions, Tritonal, Kill the Noise - Horizon (feat. HALIENE) Released by Enhanced http://enhancedmusic.com/home/ https://soundcloud.com/enhanced https://www.facebook.com/EnhancedMusic Get Horizon Now: https://enhanced.lnk.to/Enhanced349Yo REFERENCES: Ehrlich, Robert. 2015. “Six Observations Consistent with the Electron Neutrino Being a m2=-0.11±0.02eV2 Tachyon.” Astroparticle Physics 66 (June): 11–17. https://doi.org/10.1016/j.astropartphys.2014.12.011. Fried, H. M., and Y. Gabellini. 2016. “The Birth and Death of a Universe.” The European Physical Journal C 76 (12): 709. https://doi.org/10.1140/epjc/s10052-016-4577-8. Grøn, Øyvind, and Sigbjorn Hervik. 2007. Einstein’s General Theory of Relativity: With Modern Applications in Cosmology. Springer Science & Business Media. https://market.android.com/details?id=book-IyJhCHAryuUC. Makukov, Maxim A., Eduard G. Mychelkin, and Vladimir L. Saveliev. 2016. “On Possible Tachyonic State of Neutrino Dark Matter.” International Journal of Modern Physics: Conference Series 41 (January): 1660133. https://doi.org/10.1142/S2010194516601332. Mychelkin, Eduard G., and Maxim A. Makukov. 2017. “Tachyonic Approach to Neutrino Dark Matter.” In The Fourteenth Marcel Grossmann Meeting, 2591–96. WORLD SCIENTIFIC. https://doi.org/10.1142/9789813226609_0311. Recami, E. 2009. “The Tolman-Regge Antitelephone Paradox: Its Solution by Tachyon Mechanics.” Electronic Journal of Theoretical Physics. https://www.researchgate.net/profile/Erasmo_Recami/publication/2077024_The_Tolman-Regge_Antitelephone_Paradox_Its_Solution_by_Tachyon_Mechanics/links/0c1c93028f041d2ec2e910d8/The-Tolman-Regge-Antitelephone-Paradox-Its-Solution-by-Tachyon-Mechanics.pdf. Spencer, Joseph Andrew, and James T. Wheeler. 2008. “The Existence of Time.” arXiv [gr-Qc]. arXiv. http://arxiv.org/abs/0811.0112. Hello Sprint Executives, thanks for reading this.
Views: 769213 Strange Mysteries
Light | The Dr. Binocs Show | Learn Videos For Kids
 
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Hey Kids, have you ever thought what would we do without lights? Well, Dr. Binocs is here to light up your tickling brain cells. Watch the video so as to know interesting facts about light! The detailed video break-up is given below 00:24 – What is Light? 00:32 – How does light travel? 00:47 – Transparent Object 01:08 – Opaque Objects 01:31 – Translucent Object 02:17 – Refraction 02:49 – Trivia Time Voice Over Artist - Joseph D'Souza Script Writer - Sreejoni Nag Director - Aashka Shah Visual Artists - Aashka Shah, Pranav Korla Illustrators - Aashka Shah, Pranav Korla Animators - Tushar Ishi, Rupesh Hire, Digamber Bhadre VFX Artist - Swapnil Ghoradkar Background Score - Jay Rajesh Arya Sound Engineer - Mayur Bakshi Creative Head - Sreejoni Nag Producer: Rajjat A. Barjatya Copyrights and Publishing: Rajshri Entertainment Private Limited All rights reserved. Share on Facebook - http://goo.gl/7k7Kxi Tweet about this - http://goo.gl/WDfrOk SUBSCRIBE to Peekaboo Kidz:http://bit.ly/SubscribeTo-Peekabookidz Catch Dr.Binocs At - https://goo.gl/SXhLmc To Watch More Popular Nursery Rhymes Go To - https://goo.gl/CV0Xoo To Watch Alphabet Rhymes Go To - https://goo.gl/qmIRLv To Watch Compilations Go To - https://goo.gl/nW3kw9 Catch More Lyricals At - https://goo.gl/A7kEmO Like our Facebook page: https://www.facebook.com/peekabootv
Views: 630105 Peekaboo Kidz
How Far Will Light From a Star Travel in One Year? : Space & Astronomy
 
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Subscribe Now: http://www.youtube.com/subscription_center?add_user=ehoweducation Watch More: http://www.youtube.com/ehoweducation Light from a star will travel a very specific distance in one year. Find out how far light from a star will travel in one year with help from an astrophysicist in this free video clip. Expert: Eylene Pirez Filmmaker: bjorn wilde Series Description: Astronomy and the study of outer space raise seemingly infinite questions. Travel into space and get some answers with help from an astrophysicist in this free video series.
Views: 2764 eHowEducation
Stephen Hawking - Rocket to the Future
 
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Stephen Hawking examines how we may some day, travel to the future. Into The Universe With Stephen Hawking - Time Travel This video belongs to Discovery Communications and is being used for educational purposes only
Views: 2908105 WeAreStarStuff51
How Fast Light Travels?
 
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The speed of light in vacuum, commonly denoted c, is a universal physical constantimportant in many areas of physics. Its exact value is 299,792,458 metres per second(approximately 300,000 km/s (186,000 mi/s). For more information, click this link: https://www.google.com/amp/s/amp.space.com/15830-light-speed.html
Views: 116 Think Insights
How Small And How Big You Are
 
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ZOOM in and out space earth planet cool sweet science technology cells cell atoms atom The speed of light, usually denoted by c, is a physical constant representing the speed at which light and all otherelectromagnetic radiation travels in vacuum. Its value is exactly 299,792,458 metres per second[1][2] (approximately 186,282 miles per second). In the theory of relativity, c connects space and time, and appears in the famous equation of mass--energy equivalence E = mc2.[3] The speed of light is the speed of all massless particles and associated fields in vacuum, and it is predicted by the current theory to be the speed of gravity and of gravitational waves and an upper bound on the speed at which energy, matter, and information can travel. The speed at which light propagates through transparent materials, such as glass or air, is less than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200,000 km/s; therefractive index of air for visible light is about 1.0003, so the speed of light in air is very close to c. Ole Rømer first demonstrated in 1676 that light travelled at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. After centuries of increasingly precise measurements, in 1975 the speed of light was known to be 299,792,458 m/s with a relative measurement uncertainty of 4 parts per billion. In 1983, the metre was redefined in the International System of Units (SI) as the distance travelled by light in vacuum in 1⁄299,792,458 of a second. As a result, the numerical value of c in metres per second is now fixed exactly by the definition of the metre.[1][2] A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a vA light year is a way of measuring distance. That doesn't make much sense because "light year" contains the word "year," which is normally a unit of time. Even so, light years measure distance. You are used to measuring distances in either inches/feet/miles or centimeters/meters/kilometers, depending on where you live. You know how long a foot or a meter is -- you are comfortable with these units because you use them every day. Same thing with miles and kilometers -- these are nice, human increments of distance. When astronomers use their telescopes to look atstars, things are different. The distances are gigantic. For example, the closest star to Earth (besides our sun) is something like 24,000,000,000,000 miles (38,000,000,000,000 kilometers) away. That's the closest star. There are stars that are billions of times farther away than that. When you start talking about those kinds of distances, a mile or kilometer just isn't a practical unit to use because the numbers get too big. No one wants to write or talk about numbers that have 20 digits in them! So to measure really long distances, people use a unit called alight year. Light travels at 186,000 miles per second (300,000 kilometers per second). Therefore, a light second is 186,000 miles (300,000 kilometers). A light year is the distance that light can travel in a year, or: 186,000 miles/second * 60 seconds/minute * 60 minutes/hour * 24 hours/day * 365 days/year = 5,865,696,000,000 miles/year A light year is 5,865,696,000,000 miles (9,460,800,000,000 kilometers). That's a long way! Using a light year as a distance measurement has another advantage -- it helps you determine age. Let's say that a star is 1 million light years away. The light from that star has traveled at the speed of light to reach us. Therefore, it has taken the star's light 1 million years to get here, and the light we are seeing was created 1 million years ago. So the star we are seeing is really how the star looked a million years ago, not how it looks today. In the same way, our sun is 8 or so light minutes away. If the sun were to suddenly explode right now, we wouldn't know about it for eight minutes because that is how long it would take for the light of the explosion to get here. How Far is a Light-Year? A light-year is a unit of length used by astronomers to measure interstellar distance (the distance between stars). A light-year is defined as the distance that light will travel in a year. If the speed of light is 186,000 miles per second (300,000 km per second), then calculate the distance that light will travel in one year. Express your answer in miles per year. [Note: Cancel similar units above and below the dividing line. This process is known as "dimensional analysis."] Solution: 186,000 mi/sec x 60 sec/min x 60 min/hr x 24 hr/day x 365 days/yr
Views: 7995 Gurjeet Sekhon
Why Is The Speed Of Light The Speed Of Light? | Answers With Joe
 
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You may be familiar with the speed of light, but the reason it exists and how we discovered it is pretty fascinating. Support me on Patreon! http://www.patreon.com/answerswithjoe Follow me at all my places! Instagram: https://instagram.com/answerswithjoe Snapchat: https://www.snapchat.com/add/answerswithjoe Facebook: http://www.facebook.com/answerswithjoe Twitter: https://www.twitter.com/answerswithjoe ============= LINKS LINKS LINKS: PBS Space Time videos: The Speed of Light is NOT About Light https://www.youtube.com/watch?v=msVuCEs8Ydo The Geometry of Causality https://youtu.be/1YFrISfN7jo http://www.iflscience.com/space/solar-system-speed-light/ https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/Lene_Hau https://aeon.co/essays/why-is-the-speed-of-light-the-speed-of-light https://www.sciencenews.org/article/speed-light-not-so-constant-after-all ============ Transcript: So when we talk about the speed of light, the first thing to remember is that light is just a sliver of the entire electromagnetic spectrum, ranging from gamma rays to radio waves. So we’re really talking about the speed of electromagnetism. James Clerk Maxwell was the genius who first described the properties of electromagnetism into physics equations. From these equations, we can calculate the speed of light. 299,792 kilometers per second. Einstein was able to prove through his theory of special relativity that the closer you get to the speed of light, the more time slows down for a person in that relative frame. And if you were to go the speed of light, time would stop altogether. So if you were able to travel faster than light through spacetime, time itself would actually flip. Time would go backwards. And that would break causality. Effect would precede cause, which is impossible. The speed of light is the speed of causality. The other prediction that supports a speed limit is the idea that inertia increases as velocity approaches the speed of light. That means mass increases. So mass is a speed impediment. Nothing that has mass can go the speed of light. But if you are massless, you can only go the speed of light, because you have no speed impediments. And photons are massless particles. Particles that must travel at the speed of light and because they are traveling at the speed of light, time stands still from its point of view. So really, that video I talked about earlier is all wrong, from the perspective of the photon, that journey would have occurred instantly. So when you look at a star at night, that massless photon might have traveled a million light-years to reach you, but its experience was instantaneous. Now there is another theory that’s a little controversial but starting to gain some ground. It says that the speed of light is actually caused by quantum vacuum fluctuations. See, quantum field theory claims that empty space is actually not empty at all but filled with quantum fluctuations and virtual particles popping in and out of existence. And two different teams of researchers have calculated c using electromagnetic properties of the quantum vacuum, so it could be that the quantum foam of virtual particles and fluctuations may be slowing the speed of light. But what if the speed of light wasn’t the speed of light? What if Galileo was right and the speed is infinite? Then nothing would exist. Because matter is made of energy, it would take infinite energy to create any mass. Time and space wouldn’t exist because all things communicate with each other instantaneously. Cause and effect wouldn’t exist. But if the speed of light were slower, that might be even cooler. Because then we could see all the way back to the big bang. The speed of light, of course, is just one of many constants in the universe, like gravity, the specific charges and masses of the fundamental particles, quantum effects, and the list goes on. A whole handful of very specific constants that if they were just a little bit different, we would never exist.
Views: 323530 Joe Scott