Hydrogen nucleus combines to form helium then energy is released.
Binding energy/nucleon of `He` is greater than hydrogen.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

A

Explanation

(a) A nuclear reaction in which two lighter nuclei are fused together to form a heavier nuclei is called nuclear fusion. In such a process, more stable nuclei come into existence and binding energy per nucleon increases. Fusion reactions are highly exothermic because of less of mass during fusion. e.g.
`._1^2 H + ._1^(2) H rarr ._2^(4) He + 24.9 MeV`.