In an atom, an electron can jump from L shell to N shell by

Options

A. emitting energy
B. absorbing energy
C. increasing its velocity
D. none of these

Explanation

To solve the question of how an electron can jump from the L shell to the N shell in an atom, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electron Shells**:
- Electrons are arranged in shells around the nucleus of an atom. The shells are designated by principal quantum numbers (n), where K shell is n=1, L shell is n=2, M shell is n=3, and N shell is n=4.

2. **Energy Levels of Shells**:
- Each shell has a specific energy level. The energy increases as you move from the K shell to the N shell. Therefore, the L shell (n=2) has a lower energy compared to the N shell (n=4).

3. **Energy Absorption**:
- For an electron to move from a lower energy level (L shell) to a higher energy level (N shell), it must gain energy. This process is known as energy absorption.

4. **Conclusion**:
- Therefore, the correct answer to the question is that an electron can jump from the L shell to the N shell by **absorbing energy**.

### Final Answer:
An electron can jump from the L shell to the N shell by **absorbing energy**.

---