Complete the following fusion reactions —

(a) ${}_2^3\text{He}${2}^{3}\text{He} + ${1}^{2}\text{H}$ ⟶ ${}_2\text{He}${2}\text{He} + ${1} \text{H}$ + energy

(b) ${}_1^2\text{H}${1}^{2}\text{H} + ${1}^{2}\text{H}$ ⟶ $_{2}\text{He}$ + $^{1} \text{n}$ + energy

(a) Name the process, nuclear fission or nuclear fusion, in which the energy released per unit mass is more?

(b) Name the process, fission or fusion which is possible at ordinary temperature.

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

What do you mean by nuclear energy? What is responsible for it's release?