Solution :
Stellar energy is the energy obtained continuously from the sun and the stars. It is estimated that the sun has been radiating $$3.8 \times {10^{26}}J$$ of energy per second for billions of years. Bethe postulated that the interior of the sun and stars provide conditions for the fusion of hydrogen nuclei to form helium nuclei with the release of heavy amount of energy. Hence, solar energy is due to fusion reaction.
Releted MCQ Question on Modern Physics >> Atoms or Nuclear Fission and Fusion
In the nuclear fusion reaction
$$_1^2H + _1^3H \to _2^4He + n$$
given that the repulsive potential energy between the two
nuclei is $$ \sim 7.7 \times {10^{ - 14}}J,$$ the temperature at which the gases must be heated to initiate the reaction is nearly
[Boltzmann’s Constant $$k = 1.38 \times {10^{ - 23}}J/K$$ ]
The binding energy per nucleon of deuteron $$\left( {_1^2H} \right)$$ and helium nucleus $$\left( {_2^4He} \right)$$ is $$1.1\,MeV$$ and $$7\,MeV$$ respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is