Re:But good sir, what is electricity?
by sightbroke on Sunday February 23, 2025 @01:56PM
(#43151997)
https://en.wikipedia.org/wiki/Electromagnetic_radiation
"In a vacuum, electromagnetic waves travel at the speed of light, commonly denoted c."
I would expect that in air, that the photon from the light source and the perturbance of the electric field from the charge to reach the detector at the same time.
Yes, essentially.
The perturbation of the electrical field causes EM radiation (radio), which moves at the speed of light.
Re:But good sir, what is electricity?
by tsimionescu on Monday February 24, 2025 @02:13AM
(#43156641)
It moves at the same speed as light (it is light), but not at the "speed of light" (c). Light/EM waves move slower than c in air (and much slower than c in a copper wire).
Re:But good sir, what is electricity?
by B1FF_PSUVM on Sunday February 23, 2025 @04:52PM
(#43153567)
Correct, you're detecting electromagnetic fields in the same medium.
It's close enough to c that you should just use c but it can be observed that it's less.