Question

Find the mass energy of a proton at rest in MeV. [m_p = 1.673 × 10^-27 kg]

Answer 1

Data : m_p = 1.673 × 10^-27 kg, 

c = 3 × 10⁸ m/s, 1 eV = 1.602 × 10^-19 J 

∴ 1 MeV = 10⁶ × 1.602 × 10^-19 J = 1.602 × 10^-13 J

The mass energy of a proton at rest,