(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

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

3. The attempt at a solution

I dont 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..

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# Ratio kinetic energy of alpha particle / kinetic energy of proton

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