Question

What is the ratio of the relativistic mass to the rest mass for an electron and a proton when it is accelerated from rest through a potential difference of 15mv(mega volts)

take mass of electron=0.5mEv and mass of proton=1000mEv

Answer 1

$$(\gamma-1)E_0=W$$

1)

$$(\gamma_e-1)0.5=15\\\gamma_e=31$$

2)

$$(\gamma_p-1)1000=15\\\gamma_p=1.015$$