- #1

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## Homework Statement

A photon and alpha particle are accelerated from rest through the same potential difference.

After acceleration what is the ratio kinetic energy of alpha particle / kinetic energy of proton?

## Homework Equations

I guess I have to use eV = 1/2mv^2

## The Attempt at a Solution

I don't know what value have to be used in place of e in equation eV = 1/2mv^2

the mass of alpha particle is approximately 4 times of photon and that's all i know

I guessed the answer as 4 but the answer was 2

I think there is something to do with the velocity of alpha particle and photon but I'm stucked can not think of anything..