If an electron and a positron annihiliate, then the energy released is

$3.2 × 10^{-13} J$ $1.6 × 10^{-13} J$ $4.8 × 10^{-13} J$ $6.4 × 10^{-13} J$

$1.6 × 10^{-13} J$

Mass of electron = mass of positron = 9.1 × 10-31 kg Energy released  E = (2m) . c2 $=2 × 9.1 × 10^{-31} ×\left(3 × 10^8\right)^2=1.6 × 10^{-13} J$.