CBSE 2025 · Region 2 · Set 1 · Q27 · 3 marks
(a)Show the variation of binding energy per nucleon with mass number. Write the significance of the binding energy curve.(b)Two nuclei with lower binding energy per nucleon form a nuclei with more binding energy per nucleon.(i)What type of nuclear reaction is it?(ii)Whether the total mass of nuclei increases, decreases or remains unchanged?(iii)Does the process require energy or produce energy?
(a)
Show the variation of binding energy per nucleon with mass number. Write the significance of the binding energy curve.
(b)
Two nuclei with lower binding energy per nucleon form a nuclei with more binding energy per nucleon.
(i)
What type of nuclear reaction is it?
(ii)
Whether the total mass of nuclei increases, decreases or remains unchanged?
(iii)
Does the process require energy or produce energy?
Marking-scheme solution
(a)
Significance of the binding energy curve:
Why lighter nuclei undergo fusion and heavier nuclei undergo fission.
Nuclear forces are short ranged.
Energy is released in both nuclear fission and nuclear fusion.
(i)
Nuclear fusion
(ii)
Decreases
(iii)
Energy is produced
NucleiMass-Energy and Nuclear Binding 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.