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Assertion : Energy is released in nuclear fission.
Reason : Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.
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Reason : Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.
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If both assertion and reason are true and reason is the correct explanation of assertion
When a heavy nucleus splits into two medium-sized ones, each of the new nuclei will have more binding energy per nucleon than the original nucleus. The extra energy will be given off. $e . g$. if the uranium nucleus ${ }_{92}^{235} \mathrm{U}$ is broken into two small nuclei, the binding energy difference per nucleon is about $0.8 \mathrm{MeV}$. The total energy given off is therefore
$$
\frac{0.8 \mathrm{MeV}}{\text { nucleon }} \times 235 \text { nucleon }=188 \mathrm{MeV}
$$
$$
\frac{0.8 \mathrm{MeV}}{\text { nucleon }} \times 235 \text { nucleon }=188 \mathrm{MeV}
$$
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