Practice portal › Nuclei › Mass-Energy and Binding Energy
Statement-1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
Statement-2: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.
Asked in JEE Main 2008 · Binding energy curve and nuclear force
- (1) Statement-1 is true, statement-2 is false.
- (2) Statement-1 is false, statement-2 is true.
- (3) Statement-1 is true, statement-2 is true; statement-2 is a correct explanation for statement-1.
- (4) Statement-1 is true, statement-2 is true; statement-2 is not a correct explanation for statement-1.
Answer: (1) Statement-1 is true, statement-2 is false.
Step-by-step solution
Statement-1: true.
Statement-2 has it backwards: for heavy nuclei B/A falls with Z, for light nuclei it rises.
Why the other options are wrong
- (2) Reverses the truth of both.
- (3) Accepts statement-2, which has the trends reversed.
- (4) Accepts statement-2.
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