dave comments on I can whistle at the speed of sound

I can whistle at the speed of sound (sh.itjust.works)

submitted 2 years ago by sjmarf@sh.itjust.works to c/science_memes@mander.xyz

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[–] dave@feddit.uk 23 points 2 years ago (2 children)

It would also still be the speed of light. Always is, unless you specify ‘in a vacuum’ every time.

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[–] tacosplease@lemmy.world 12 points 2 years ago (1 child)

Adding to the fun - The light is still going the same speed within the medium, but it's bumping into more things. Those collisions divert the light, lengthening the distance it travels through something like 1 cm of glass vs 1 cm in a vacuum. It changes the time it takes to travel through glass rather than the speed at which the light is moving.

At least that's what I remember from a YouTube video.

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[–] xx3rawr@sh.itjust.works 5 points 2 years ago (1 child)

Probably the Youtube video in question

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[–] tacosplease@lemmy.world 4 points 2 years ago

Yes that's it! Thanks for the link!!

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[–] kuberoot@discuss.tchncs.de 2 points 2 years ago

The real fun starts when things move faster than the speed of light, that's when you get Cherenkov radiation!

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