Calculate the energy in MeV equivalent to the rest mass of an electron . Given that the rest mass of an electron , `m=9.1 xx 10^(-31) kg`, `1MeV = 1.6 xx 10^(-13) J` and speed of light , `c= 3 xx 10 ^(8) ms ^(-1)`.

Explanation

According to the convertion of mass and energy
`E=m_(0)c^(2)=9.1xx10^(-31)xx(3xx10^(8))^(2)=81.9xx10^(-15)J`
`=(81.9xx10^(-15))/(1.6xx10^(-13))=0.512MeV`