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Draw the curve showing the variation of binding energy per nucleon with the mass number of nuclei. Using it explain the fusion of nuclei lying on ascending part and fission of nuclei lying on descending part of this curve.

 

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  • On the ascending part of the curve, B.E./A increases with the mass number (A).
    So, B.E. of the resultant will be greater than that of the nuclei which are fused together. Hence the fusion of the nuclei on the ascending part results in an increase in binding energy, therefore, more stable nucleus
  • On the descending part of the curve, the B.E. of the heavier nuclei is lower. So the fission of the heavier nuclei, on the descending part, will 
    cause an increase in B.E. and, therefore, more stable nucleus
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Safeer PP

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