Question

Fusion reaction is more energetic than fission reaction because

• A. Uncontrolled chain reaction is taking place in the fusion reaction.
• B. Fusion reaction is taking place at very high temperature
• C. The energy released per unit mass of the fuel in fusion reaction is larger than the energy released per unit mass of the fuel in fission reaction.
• D. In the fusion reaction lighter nuclei combine to form a heavier nucleus

Hint:

Fusion is more energetic because of higher binding energy gain per nucleon compared to fission.

Answer 1

The Correct Option is C

Step 1: Understand fusion and fission.
Fusion combines light nuclei, while fission splits heavy nuclei.

Step 2: Energy origin.
Energy comes from mass defect and conversion into energy using \( E = mc^2 \).

Step 3: Binding energy concept.
Binding energy per nucleon is higher for medium mass nuclei.

Step 4: Fusion advantage.
In fusion, light nuclei move towards higher binding energy region.

Step 5: Energy comparison.
Fusion releases more energy per unit mass than fission.

Step 6: Reject incorrect options.
Other options describe conditions or processes, not the reason for higher energy.

Step 7: Final Answer.
\[ \boxed{\text{Option (C)}} \]