What is the source of energy of sun or stars?

Name the following nuclear reactions —

(a) ${}_{92}^{235}\text{U}${92}^{235}\text{U} + ${0}^{1}\text{n}$ ⟶ ${}_{38}^{90}\text{Sr}${38}^{90}\text{Sr} + ${54}^{143}\text{Xe}$ + 3 $_{0}^{1}\text{n}$ + γ

(b) ${}_1^3\text{H}${1}^{3}\text{H} + ${1}^{2}\text{H}$ ⟶ ${}_2^4\text{He}${2}^{4}\text{He} + ${0}^{1}\text{n}$ + γ

Write down the Einstein’s mass-energy equivalence relation, explaining the meaning of each symbol used in it.

(a) What is a.m.u? Express 1 a.m.u. in MeV.

(b) Write the approximate mass of a proton, neutron and electron in a.m.u.