Question

if electrons are caused to fall through a potential difference of 10^5V, determine their
final speed if they were initially at rest.​

Answer 1

There is no way to tell since the units of the potential are not included.

If “volts” then the final kinetic energy is 100keV … you can use the kinetic energy equation to get the speed as a fraction of the speed of light:

K=12(mc2)(v/c)2 … approx for low speeds.

For an electron, mc^2 = 511keV

I get about v = 0.6c … but I could be wrong

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