Question

Express $16$mg mass into equivalent energy in electron volt.

Answer 1

The mass equivalent of $1eV$ is$1.783\times {10}^{-36}\times {10}^{6}kg$

Or $1.783\times {10}^{-36}\times {10}^{6}mg=1eV$

So, $1mg=\frac{1}{1.783\times {10}^{-30}}eV$

ie, $16mg=\frac{16}{1.783\times {10}^{-30}}eV=8.97\times {10}^{30}eV$