CBSE 2025 · Region 6 · Set 3 · Q23 · 3 marks
(a)Differentiate between 'nuclear fission' and 'nuclear fusion'. Briefly discuss one example of each.(b)Draw a graph of potential energy between a pair of nucleons as a function of their separation.
(a)
Differentiate between 'nuclear fission' and 'nuclear fusion'. Briefly discuss one example of each.
(b)
Draw a graph of potential energy between a pair of nucleons as a function of their separation.
Marking-scheme solution
(a)
Nuclear fission is the process of splitting up of a heavy nucleus into lighter ones with a release of energy.
\[{}^{235}_{92}U + {}^{1}_{0}n \;\rightarrow\; {}^{236}_{92}U \rightarrow {}^{144}_{56}Ba + {}^{89}_{36}Kr + 3\,{}^{1}_{0}n\]
Nuclear fusion is the process of fusing of two lighter nuclei to form a heavier nucleus with the release of energy.
\[{}^{1}_{1}H + {}^{1}_{1}H \;\rightarrow\; {}^{2}_{1}H + e^{+} + \nu + 0.42\,\text{MeV}\]
(b)
NucleiNuclear EnergyUnderstandshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.