Question

Calculate, What is the mass of the electron when it's moving with KE of 10 Mev.​

Answer 1

it depends on the speed.

Answer 2

Formula for calculation the mass of electrons in terms of charge is

Q = ne [where Q = Charge of electricity, n = number of electrons and e = charge of one electron]

Charge of 1 electron =$1.6 \times 10^{-19}$

K.E = 10 MeV given

we know K.E = (1/2)mv².

= 1 *1.6 * 10^-13

= 1.632 * 10^-13 J

mass of electron = 9.1* 10^-31 kg