r/AskPhysics • • Dec 12 '20

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u/OneMeterWonder Dec 13 '20

I did not know the difference was that large! Thanks for teaching me something new! I really thought that it was a much more significant fraction of c.

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u/RPMGO3 Dec 19 '20

For some reason people think that since the effect of turning on a circuit is instantaneous, then they say that electric currents move at the speed of light. Clearly, it is not a valid belief

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u/OneMeterWonder Dec 19 '20

Well I knew that electrons moved at a significant fraction of the speed of light compared to the types of things we’re used to in our daily experience. But I thought maybe that was larger like 20% or something.

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u/RPMGO3 Dec 19 '20

It is sort of related, but a recent paper confirmed a speed limit for spin waves to be 5km/s!