GAMMA DECAY

Options

A. A.Pair anninilation takes place
B. B.Energy is released due to converstion of neutron into proton
C. C.Energy is released due to de-excitation of nucleus
D. D.None of these

Answer

To solve the question regarding gamma decay, we will analyze each of the given options and determine which one correctly describes the process of gamma decay.

### Step-by-Step Solution:

1. **Understanding Gamma Decay**:
- Gamma decay is a type of radioactive decay where an unstable nucleus releases energy in the form of gamma radiation (γ-rays) to reach a more stable state. This process does not change the number of protons or neutrons in the nucleus but rather involves the transition from a higher energy state to a lower energy state.

2. **Analyzing the Options**:
- **Option A**: "Pair annihilation takes place."
- Pair annihilation refers to the process where a particle and its antiparticle (like an electron and a positron) collide and annihilate each other, producing gamma rays. This is not directly related to gamma decay.

- **Option B**: "Energy is released due to the conversion of neutron into proton."
- This describes beta decay, not gamma decay. In beta decay, a neutron is converted into a proton (or vice versa), which is not the mechanism of gamma decay.

- **Option C**: "Energy is released due to de-excitation of nucleus."
- This is correct. In gamma decay, the nucleus transitions from an excited state to a lower energy state, releasing energy in the form of gamma radiation.

- **Option D**: "None of these."
- Since we have identified that Option C is correct, this option is incorrect.

3. **Conclusion**:
- The correct answer is **Option C**: "Energy is released due to de-excitation of nucleus."

### Final Answer:
The correct option is **C**: Energy is released due to de-excitation of nucleus.

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