How Fast Is It - 02 - The Speed of Light (4K)

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In this segment of the “How Fast Is It” video book we cover the speed of light. We start with the slow-moving snail and work up through people, animals, birds, cars, aircraft and spaceships. Along the way we graph speeds on a space-time diagram. Following the history of land speed records, we cover the speed of sound and include its nature as a longitudinal wave and its speed in dry air and the sound barrier. We then cover the Galilean transformations for converting speeds from one reference frame to another. We increase the velocities to the point where we see light traveling at different speeds as far as the Galilean transformations are concerned. We then show how Galileo tried and failed to measure the speed of light; Roemer’s use of Jupiter’s moon Io; and then we show how Antonio Louis Fizeau did measure the speed of light. We’ll also cover Maxwell’s speed of light calculations; We then cover wave interference and the Michelson Interferometer. And using the interferometer, we cover the Michelson-Morley experiment that showed that the speed of light was a constant. We finish with a look at the two main modern ways for measuring the speed of light.
Music:
@01:04 Giachino Rossini - William Tell Overture; London Philharmonia Orchestra; from the album The London Philharmonic Collection: Light Classics 2009
@01:53 Beethoven - Symphony No 7 Allegretto; Carlos Kleiber & Wiener Philharmoniker; from the album Beethoven: Symphonies Nos.5 & 7 1995
@13:12 Mozart - Violin Concerto No 5 Turkish II; Christian Altenburger, German; from the album 50 Must-Have Adagio Masterpieces 2013
@28:14 Joseph Haydn - Symphony No 98; Cappella Coloniensis; from the album 50 Must-Have Adagio Masterpieces 2013
@38:32 Chopin - Raindrops; from the album The Romantic World of Chopin's Piano, Vol. 3 2000

[@justinkelleher3405]

Glad to see you're still making these videos David!

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He’s a KZbin treasure

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Why the hell does he not have a million subscribers already??? Sir Butler, your work product sits atop the highest shelf-among the best media available to anyone anywhere. Please never stop dropping these beautiful bombs. 🤘😆🤘

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This channel should have at least 161 million subs. But i guess only intelligent people enjoy the awesome voice of Mr Butler.

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Sir Butler is worth more than a thousand preachers.

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Because he doesn't need numbers to show how brilliant he is, we already know

[@ltrizzle12]

@@Alasdair-Morrison WE know. That’s selfish if we feel his popularity and growth should cease expansion. He needs numbers so even more people can discover how brilliant he is, as their lives can also become enriched through his work. AND those numbers directly translate to Mr. Butler maximizing profit in well-deserved celebration of his efforts. Let’s help my man get paid. Those are numbers we can all agree he deserves. 😎

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Because people are not intersted in getting smater, just entertained.

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The master has returned

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Hey, mr.butler, I'm not one of these weirdos and conspiracy theorists who think you're doing something awful by sharing about how we know that there is a speed of light. I just wanted to chime in and say that I think your channel rules. I wish these weirdos would go away, but that's the internet for you. It makes me so happy, every time I see you post. I appreciate that it takes a lot of hard work, research, and expertise to produce these...

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This one has the light! Praise! Praise! God keep you brother LOL.

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This is the most underrated channel on this platform, I really appreciate the hard work that Mr Butler puts in these videos to teach us

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So glad to see you back with uploads! I can't wait to get to enjoy this video in full quality. I remember how thrilled I was the first time I found your video series, and enjoyed them time and time again. Thank you! And have a wonderful time watching the updates from the James Webb telescope.

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Mr. Butler ...you are a GIFT.... thank you very much for your patience , your dedication, and for beeing a real TEACHER, in the broadest sense of the word.

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Sir, I really must say, you are so great and so humble. And obviously SO BRILLIANT.

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It's a true blessing to have you and learn from you, Mr. Butler.

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Love the videos...thank you for your time sir 💨

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thanks David, love your work and dedication, i can finally understand many things, greetings from Venezuela

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Thanks David, great educational video.

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this channel is KZbin gold. thanks for everything, Dr Butler

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thank you so much for these videos!! Beautiful composition

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Astounding.

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It’s like Christmas when you release these. Thank you and well-wishes for a long time to come!

[@askavalnathan379]

What a great video. Thankyou David.

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Thank you for so eloquently and succinctly sharing this wonderful information and the history of how people figured this all out. Brilliant job

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I love these type of videos. Keep uploading!

[@willk7184]

It is so helpful to have the graphics go slow enough that we have time to comprehend what's really happening. Thanks for your patient and lucid explanations!

[@tadswanchanyarakskul2532]

I'm so glad that you continue to produce more beautiful videos. Thank you so much Mr. Butler. I'm in tears.

[@RonnieD1970]

Awesome! More amazing content as usual!

[@AbdulMateen-nt4er]

Was waiting for it. Thank you Mr David 🙏

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This is my favorite series on all of KZbin

[@austinballard3818]

This deserves more views than it has.

[@colspiracy8326]

OK I agree. I'm going to watch it 3 times. 👍

[@ami2evil]

Nah, most people are far too stupid to comprehend any of this...

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Thankyou...Very Much! Special work that is deeply appreciated!

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So excited to see a new video from you, I've been patiently waiting!

[@xarzu]

David, I am grateful for the work you do. It is the most entertaining thing on youtube. Honesty is refreshing. And science if honesty.

[@oleran4569]

Wonderful stuff!

[@EndureTemptation]

Dude found and excellent hobby for himself in retirement making these videos. Invaluable for future generations! And for me.

[@beekneed]

Watching these is a true joy. Thank you so very much for your dedication to such high quality communication. I missed the math & science boat growing up: I can barely multiply fractions and still don't know the order of operations. In spite of what might to some sound like a total disqualification for appreciation of the world of physics, I feel such a thrill of discovery and enlightenment while watching your videos, regardless. I can at least enjoy some small part of wonder in the beauty and elegance of our world, and an immense appreciation of & gratitude for the minds and dedication of the thinkers & scientists who CAN "do the math."

[@dennistafeltennis1190]

I wonder how fast the Universe is expanding. One thing is for sure it moves faster then light.

[@rkristel82]

I'm doing my part for the KZbin algorithm. Keep up the amazing work!

[@tpwb5882]

Thank you sir 🙏🏼🙏🏼🙏🏼 this is our favorite KZbin channel about science on the internet. God bless you more health and happiness

[@peterparsons7141]

Truly an excellent presentation. I will use this video to help educate my grandchildren, I hope the enjoy it as much as I do. I really like the fact that there area large number of important fundamental things at different levels. Such a good building block with something for all levels of interest.

[@wheelerdealer7098]

Greetings from uk. Love you're channel ❤️ keep up the great work 👍

[@ironheart6704]

Thank you for en-lightining us, mr Butler. :D

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All these video's are truly monumentally magnificent. On behalf of all ur Butler Groupies from here in Liverpool, England and all point's we salute u

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My thanks to all the Liverpool Groupies. My mother, who was in the Women's Air Corp, met my father, who was an officer in the US Navy, in Liverpool during WW II.

[@SimonMcGrath-o8jk]

@@howfarawayisit oh my goodness, thank u for the reply and thanx to this great city we have u. I've been watching ur "classes" from the start and u have broadened my knowledge no end whilst making it interesting and wanting to learn or even devour more. Some "classes" I watch it's just monotonous but u come thru wanting us to enjoy and if u learn something new then all the better as long as u enjoyed the journey and the updates u do are a case in point, don't stop, u have a lot of loyal groupies ha ha.

[@OVAstronomy]

Excellent video on an otherwise complicated and hard to explain topic!

[@G274Me]

Beautiful backyard indeed, and an even more beautiful cosmos we find ourselves in.

[@jimc.goodfellas]

Who else has been waiting for Mr Butler to upload one of these longer videos?

[@mysterycrumble]

your videos are fantabulously good, sir!

[@reynal_omnicide9217]

46 minutes of high quality content

[@ajpyyz]

So glad to see you are back once again!! Love your videos

[@Igor-ug1uo]

Thank you, Mr. Butler. I have been watching your lessons for a few years and I've always enjoyed your explanations as well as the presentation. I'm glad you keep doing this work.

[@kjhman]

These videos are fucking fantastic. Such a breath of fresh air compared to the other stuff that’s out there with a a bunch of ads and people begging for likes and subscribes. Thank you for putting out great content in this day and age.

[@ronalddepesa6221]

Your videos are Amazing

[@davidyancey2807]

God bless you for trying to school even some of the idiots that left the comments below. I get a little nutty myself sometimes so I am very grateful to have your work to watch to ground me, I have no way to tell you how much that means, but please accept my humble thanks for keeping the light alive.

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I’m from Brazil and wanna say Thank you for This Mr. Butler!

[@drhmufti]

I’m gonna hide this video from my Gran…. Those shorts! Young Man!!

[@michelmayhem]

I absolutely love this channel. Thank you so much for all the great work!

[@junkequation]

so excited for this upload

[@doggonemess1]

David Butler is the Bob Ross of physics. And I mean that as a huge compliment. He breaks everything down until even a doofus like me can understand and does it without annoying jump cuts and gimmicks, while delivering a calming narration. Just like Bob.

[@sempertard]

The Lock Picking Lawyer of space.

[@frauleinhohenzollern]

".... His conclusion was: light was very fast" I don't know why but that got me to chuckle

[@osvaldo17924]

Thank you Mr. Butler. It’s so glad to see you back in the channel. I hope you can make a video about JWST. 🙏🏻

[@Youssef_Salmane]

Just adding a comment so that the algorithm recommends the video to more people

[@davidyancey2807]

My favorite channel. Butler is a master.

[@CobraQuotes1]

My favorite youtuber of all time, david butler!

[@Allworldsk1]

Waited for this. Thank you 🌌🌌

[@eliotsalandybrown]

These videos are magical treats

[@MrDschubba]

Best internet content by an astronomical unit

[@ChampuStrike]

Glad to see another video from you, very interesting

[@harshalmehta8281]

Happy to see you back. Your voice is so calming

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Thank you for contributing the hidden knowledge of the universe and enlightening us in the simplest way. Keep such vibrations up 👍

[@superbaddctv]

3/1 Hundred thousandths of an inch is crazy work

[@rwam3]

I think David is the only KZbinr who does ADR and I love it!

[@scrub_trash6680]

Hey david, im so happy to see the channel growing. I wish instead of 4k versions it was a new series :( But what you have produced is already a gold standard for science communication. Im so proud of you.

[@entropyachieved750]

After all these years of watching you, your channel is still amazing and finally getting the views it deserves. May many more years of wonderful teaching and discoveries come

[@christinestill5002]

Glad to hear you haven't softened or dumbed down the music!

[@prodfauxes]

Thank you Mr. Butler for fixing my sleep schedule

[@jensjacobs9050]

I finally understand the speed of light. Light is not a particle. It is a signal. Like a wave in a football stadium. Or a wave in a pond after throwing a stone . So comparing the speed of light with the speed of objects makes no sense at all. Thanks mr. Butler for "lighting me up"

[@andreiacsinia5088]

Photons are both particles and waves. They travel as waves but interact in a particle fashion.

[@jensjacobs9050]

@@andreiacsinia5088 That was my understanding too until one month ago. A package of wave travelling like a particle. But now I finally understand it is not a (travelling) particle at all. It is a signal only, like a moving web. When the signal is absorbed into matter (hits a surface) it behaves like "m" when the released energy of the signal is equal to E= mc^2. E can be measured, c is known, so "m" results. This "m" gives the erroneous idea that light is a particle.

[@rickwhite4137]

What an _excellent_ teacher. He's like my math teacher at university. 💯 🥇

[@JapanZen]

Glad to see a new video from you David

[@Soyouvelosttheloveofyourlife.]

Love your videos David, thank you

[@goodboy1269]

One of my favorite guys, Professor B 😎

[@johnjobs3027]

Thank you Dr. Much appreciated

[@kraxzor]

Thank you for all your videos. They are excellent.

[@sjzara]

These are magnificent videos. Thank you.

[@mortalclown3812]

In some parallel universe, that snail is clocking in at tachyons. Glad you're here today, Professor... for real science.

[@sempertard]

Uncle Dave puts out good stuff. Top drawer. Thank you sir!

[@EricMalette]

The legend returns.

[@hemnaziz8899]

Peace be upon you, sir. Your scientific posts are very important. I wish you health and safety.

[@balendra]

Thank you.

[@jeremyhuggins1369]

This is one of the few channels where, due to the exceptional content, I always give a thumbs up before the video loads. Thank you!!!

[@chainsawmelee2026]

Hello David, greetings from Poland.

[@frankdimeglio8216]

I'm 25 percent Polish. I have mathematically unified physics.

[@Firoz900]

Learning so many interesting things from you. Thank you.

[@sup5356]

Thank you David. Excellent commentary

[@DangerDave-e7u]

Thank you, sir.

[@paulcooper8818]

Nice to see new content from you.

[@Just.A.T-Rex]

I hope you’re doing well mr. butler. You’re videos have been a nighttime staple for myself for years and I’m so happy more are still being released a just know you’re out here changing life’s with knowledge and information. You rock!

[@GhostHawk76]

Glad to see you again sir!

[@nationalleagueofconcernedc6897]

Love your videos!!!

[@sarahlyons4552]

So glad to see a new video! I got through my pregnancy insomnia watching your videos, and accidentally became educated on some pretty cool stuff. Now I’m hooked!

[@henrylima6974]

David you are the best!!!

[@mortimas4137]

Best. Channel. Ever.

[@summer-west]

Garden looks great

[@utrocker7]

I wish you were my engineering physics professor back in college. I always enjoy your work.

[@williamtao2744]

thank you！

[@invalidglitch]

Glad your back .. was looking for something new.. Will keep this for my Saturday night screen cast ... enjoy all your work.