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I never understood why speed of light is a constant (c)... until now! [21:50] by FloatHeadPhysics (Oct 12, 2023) - YouTube (inv.nadeko.net)

submitted 1 week ago by [email protected] to c/[email protected]

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This video is a bit older now (over one year), but I just found about it. And I want to share it here, because it was very well explained, without boring stock videos or background music. It's just like a teacher would teach you, but with some enthusiasm behind it. I enjoy his videos so far.

Watch on YouTube: https://youtu.be/Zkv8sW6y3sY
Watch on Invidious, a more private and indirect way to watch: https://inv.nadeko.net/watch?v=Zkv8sW6y3sY

Video description:

Why is the speed of light the same in all reference frames? Let's rediscover the thought experiments that led Einstein to his special theory of relativity

Chapters:

00:00 Introduction
01:15 1/3 Detect motion with particles? (Thought experiment)
04:01 Inertia doesn't allow detecting constant velocity motion
06:18  2/3 Detect motion with waves? (Thought experiment) 
09:18 Medium doesn't allow detecting constant velocity motion
10:15 Constant velocity motion is RELATIVE!
11:02 3/3 Detect motion with light? (Thought experiment)
13:12 Does light break relativity? 
13:46 Michelson &amp; Morley's experiment (oversimplified) 
14:20 The logical conclusion - Speed of light is same in all frames

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[–] [email protected] 5 points 1 week ago* (last edited 1 week ago) (1 children)

Thank you for sharing this! I had something of a vague notion of how relativity works, but this was incredibly helpful in terms of nailing down why light is unaffected by the observer's frame. I knew of the popular concept of the luminous aether at the turn of the 20th century, but never how it was debunked. Definitely subscribed, and now off to watch the explanation of how we then arrive at E=mc^2^.

[–] [email protected] 4 points 1 week ago (1 children)

Exactly me too, lol. I was also confused about the aether, because I knew it was wrong but not why. Currently watching his explanation about how he arrive at E=mc2 right now (paused the video to link here). Not sure if this is the video you meant, but in case not I highly recommend this one too: I never understood why light has ENERGY but NO MASS... until now! - YouTube | Invidious

[–] [email protected] 3 points 1 week ago (1 children)

Learning about this channel is seriously the best thing that's happened since the election! I've just moved onto that video as well, but because of the algorithm, not your latest suggestion.

[–] [email protected] 3 points 1 week ago

Their video about how curved spacetime causes the effects of gravity is also very well done.