Curtains over a window are an example of . A. transmission B. a medium for light C. how light waves do not require a medium D. a substance that does not transmit a wave

C

Explanation:

we know that light doesn't need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.