When an electron jumps from L to K shell -

Options

A. (a) energy is absorbed
B. (b) energy is released
C. (c) energy is neither absorbed nor released
D. (d) energy is sometimes absorbed and some times released

Answer

To solve the question of whether energy is absorbed or released when an electron jumps from the L shell to the K shell, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Shells**:
- According to Bohr's theory, electrons occupy specific energy levels or shells around the nucleus. These shells are denoted by principal quantum numbers:
- K shell (n=1)
- L shell (n=2)
- M shell (n=3), and so on.

2. **Identify the Transition**:
- The question states that an electron is moving from the L shell (n=2) to the K shell (n=1).

3. **Determine Energy Levels**:
- The K shell (n=1) is at a lower energy level compared to the L shell (n=2).
- When an electron moves to a lower energy level, it releases energy.

4. **Energy Release or Absorption**:
- When an electron transitions from a higher energy level (L shell) to a lower energy level (K shell), energy is released.
- This is because the electron is moving closer to the nucleus, which is a more stable configuration.

5. **Conclusion**:
- Therefore, when an electron jumps from the L shell to the K shell, energy is released.

### Final Answer:
Energy is released when an electron jumps from the L shell to the K shell.

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