In nuclear physics, particle masses are measured in energy units, when instead of mass m, the energy of mass mc² is given (1 MeV = 1.6 ⋅ 10⁻¹⁹ J).
Determine in MeV the masses of the electron, proton, π⁰-meson, and ψ-meson
if the masses of these particles are 0.911 ⋅ 10⁻²⁷ g, 1.673 ⋅ 10⁻²⁴ g, 2.4 ⋅ 10⁻²⁵ g,
and 5 ⋅ 10⁻²⁴ g, respectively.