Answer
The energy equivalent of the rest mass of an electron is $~~0.512~MeV$
The energy equivalent of the rest mass of a proton is $~~939~MeV$
Work Step by Step
We can find the energy equivalent of the rest mass of an electron:
$E = mc^2$
$E = (9.109\times 10^{-31}~kg)(3.0\times 10^8~m/s)^2$
$E = 8.1981\times 10^{-14}~J$
$E = (8.1981\times 10^{-14}~J)(\frac{1~eV}{1.6\times 10^{-19}~J})$
$E = 5.12\times 10^5~eV$
$E = 0.512~MeV$
The energy equivalent of the rest mass of an electron is $~~0.512~MeV$
We can find the energy equivalent of the rest mass of a proton:
$E = mc^2$
$E = (1.67\times 10^{-27}~kg)(3.0\times 10^8~m/s)^2$
$E = 1.503\times 10^{-10}~J$
$E = (1.503\times 10^{-10}~J)(\frac{1~eV}{1.6\times 10^{-19}~J})$
$E = 9.39\times 10^8~eV$
$E = 939~MeV$
The energy equivalent of the rest mass of a proton is $~~939~MeV$