Einstein's mass - energy relation emerging out of his famous theory of relativity relates mass (m) to energy (E) as E=m c^2, where c is speed of light in vacuum. At the nuclear level, the magnitudes of energy are very small. The energy at nuclear level is usually measured in MeV, where 1 MeV=1.6 × 10^-13 J; the masses are measured in unified atomic mass unit (u) where uu=1.67 × 10^-27 kg.

Einstein's mass - energy relation emerging out of his famous theory of relativity relates mass (m) to energy (E) as E=m c^2, where c is speed of light in vacuum. At the nuclear level, the magnitudes of energy are very small. The energy at nuclear level is usually measured in MeV, where 1 MeV=1.6 × 10^-13 J; the masses are measured in unified atomic mass unit (u) where uu=1.67 × 10^-27 kg. 

(a) Show that the energy equivalent of 1 u is 931.5 MeV. 

(b) A student writes the relation as 1 u=931.5 MeV. 

The teacher points out that the relation is dimensionally incorrect. Write the correct relation.