Question

Statement-I : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion and
Statement-11: For heavy nuclei, binding energy per nucleon increases with increasing Z. while for light nuclei it decreases with increasing Z.

• A. Both the statements are true and Statement 2 is the correct explanation for Statement 1.
• B. Both the statements are true but Statement 2 is not the correct explanation for Statement 1.
• C. Statement 1 is true but Statement 2 is false.
• D. Statement 1 is false but Statement 2 is true.

Answer 1

The correct option is C Statement 1 is true but Statement 2 is false.

Statement-I: Both, heavy nuclei and light nuclei have low value of binding energy per nucleon. Heavy nuclei splits (fission) into light nuclei and light nuclei combine (fusion) to attain the stability i.e. higher value of binding energy per nucleon. In both processes, some mass is disappeared which is converted into energy i.e. release of energy . (statement is TRUE) .

Statement-II: For heavy nuclei the binding energy decreases with increasing Z and for light nuclei binding energy per nucleon increases with increasing Z.