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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
how is air an elastic material?
Gotta change the subject, but once we leave our galaxy, where would North be?
"…. His conclusion was: light was very fast"
I don't know why but that got me to chuckle
You even have the snail water so he wouldn't dry out 🐌🥰
👍 for giving the snail some water for the vid 🙂
I’m from Brazil and wanna say Thank you for This Mr. Butler!
David, I am grateful for the work you do. It is the most entertaining thing on youtube. Honesty is refreshing. And science if honesty.
That is not the fastest anything can travel.
David, l’ve seen most of your videos and I just have say you are a extraordinary teacher. So clear and thoughtful. I just love your work! 😊
answer WE DONT KNOW cause NOBODY MEASURE IT YET.
END OF VIDEO…..
I would tell kids that I can go faster than a bus. Then explain to them that if I run back to front in the bus, I am going ever so slightly faster.
This is my favorite series on all of YouTube
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!
What a fantastic video. Boy do i wish some of my lazy professors put in a better effort to give these kinds of visuals.
He is like an ASMR physics book. Although, it is slow and calm it’s also so interesting and engaging.
For a fast mind you sure talk slow 😂
Your videos are Amazing
This was an excellent video, as always, but it would help if you could turn on auto-generated captions at least. Thank you!
is the speed of gluons also constant?
Thank you for contributing the hidden knowledge of the universe and enlightening us in the simplest way. Keep such vibrations up 👍
Stop with the metric nonsense 😤 ….🥸
I absolutely love this channel. Thank you so much for all the great work!
Seems a man of your age put aside the meter crap. I know it's the scientific way of measurement but I would say way more than half your audience is not familiar.
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.
How far away is it? Not far enough. I see your neighbor is building an addition. Not far enough away to ensure your privacy. Mabey I'll set to see what they're up to in the next backyard comparison.
Thank you Mr. Butler for fixing my sleep schedule
Love the Mozart
Get rid of the background noise
"The William Tell Overture" for the snail was a nice touch.
Probably they are measuring the speed of time
Was it an African or European snail?
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.
Glad to hear you haven't softened or dumbed down the music!
All things considered, a snail is not that lowly. I mean, when we consider joe biden and liberal democrats, pretty much everything is noble.
So the gallery wants to talk bible verses…heres one.."don;t give it to dogs or they will throw it on the scrap heap. You are a kind Butler for throwing out scraps, but obviously there are a lot of stray mongrels in this neighborhood. You continue on because a whole crew of us are going to be minding the Cujos rabid dogs that keep barking during your presentation. This man is trying to teach you savages something and this is how you act? Who did all these "christians" show up to crucify this time?
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.
Falcon a dive is fast, but don't race pigeons have the fastest sustained speed?
The simple conclusion that was not reached in this video is that lightspeed is not additive or subtractive. The mechanisms that make this so are time dilation and Lorentz transformation. These phenomena allow time itself and the space in which a moving object occupies to seemingly contract in order to allow light to maintain a constant maximum measured speed among all reference frames. But he'll explain this in further detail in the next video…
Shit! The smell, omg… I'm lightheaded now.. what a fart!
Fuck… The smell is nauseating… That shart is a nuclear weapon… I'm about to puke from my own fart, but I am enjoying at the same time!
I've shat my pants…
How much faster is a pushed fart compared to a released fart?
How fast is a fart?
Birds, lot of birds…
ACCORDING TO THE GOD TEACH THE HUMANITY TO FLY FAST IN THE SPACE TO SAVE HER RACE FOR THE CLOSE DEATH OF THE PLANET,,, MY ANSWER TO THE GOD NO ANY HUMAN ARE INTERESTED TO YOUR INTILLIGENT,, LEAVE IT HUMAN HAVE OWN INTILLIGENT AND POWER MUCH HIGHER THAN THE GOD BY USING AND ADDING OF GRAMMAR AND SPELLING ACCORDING TO AMERICAN,, MAYBE ITS TRUE ?
THE SPEED OF LIGHT ARE 1000 YEARS TI TRAVEL OF HUMAN WITH 500 MILES PER HOUR FOR THE SPEED OF LIGHT ARE ONLY 24 HOURS REASON WHY CANNOT USE THIS OF HUMAN BECAUSE OF WEAK DNA,, THE SPEED OF LIGHT ARE THE GRAVITY BURNING OF ELECTRICITY AND THIS OBJECT ARE MANY HIGH RADIATION GIVEN MUCH HIGHER THAN NUCLEAR DANGEROUS !,, BUT THE ANTI GRAVITY CAN USE OF HUMANITY TO MAKE TRAVEL FAST IN THE SPACE
Sir , God said “ Let there be light “ and there was light !! … instantly through out the universe. I look forward to you addressing that fact in your next post.
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
What with the weird comments here