1MeV is equal to (1) 1.6�10^-19 joules (2) 1.6�10^-14 joules (3) 1.6�10^-13 joules (4) 1.6�10^13 joules

Answer: (3)

Electron volt in short Ev is the unit of energy.

one electron volt (1 eV) = 1.602 × 10⁻¹⁹ Joules

One Mega ev (1MeV) = 10⁶ × 1.602 × 10⁻¹⁹ Joules

Since Mega = 10⁶

⇒ 1Mev = 1.602 × 10⁻¹³ Joules