Question

Calculate the energy in mev equivalent of the rest mass of an electron.

Answer 1

Electron rest mass (511 keV)

The rest mass energy of an electron is calculated from:

E = mc2
E = m0c2 keV
E = (9.1 x 10-31) x (3.0 x 108)2 keV
E = 511 keV

Answer 2

Answer:

0.512 MeV

Explanation:

Mass = m = 9.1 x 10^-31 kg

Speed of electron =  c =3 x 10^8 m/s (speed of light)

E=mc^2

it comes out to be nearly 0.512 MeV