CBSE 2026 · Region 1 · Set 2 · Q21 · 2 marks
Draw a graph showing variation of binding energy per nucleon as a function of mass number A. The binding energy per nucleon for heavy nuclei (A > $\displaystyle 170$) decreases with increase in mass number. Explain its significance.
Marking-scheme solution
For $\displaystyle A > 170$, it signifies lesser stabilityNucleiMass-Energy and Nuclear Binding EnergyUnderstandvery_short_answermedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.