If an electron and a positron annihiliate, then the energy released is
Answer & explanation
Correct answer: option 2
Mass of electron = mass of positron = 9.1 × 10-31 kg
Energy released E = (2m) . c2
$=2 × 9.1 × 10^{-31} ×\left(3 × 10^8\right)^2=1.6 × 10^{-13} J$.