What Is Rest Mass And How It Differs From The Mass Of An Electron Moving At Higher Velocities?

The mass of an electron moving at a velocity much smaller than the velocity of light is known as rest mass. It is calculated by the relation:-

M=e/ (e/m) =9.1091X10^-31

where e is the charge on an electron

e/m is the ratio calculated by Millikan.

When the electron is moving at velocities comparable to the velocity of light, its mass is given by:-

m=m₀/ (1-v²/c²)^1/2

where v is the velocity of electron

c is the velocity of light

m₀ is the rest mass of the electron.