when an electron jumps from the fourth orbit to the second orbit, one gets the

Options

A. second line of paschen series
B. second line of balmer serie
C. first line pfund series
D. second line of lyman series

Explanation

To solve the question "When an electron jumps from the fourth orbit to the second orbit, one gets the...", we need to understand the concept of electron transitions in hydrogen-like atoms and the associated spectral series. Here's the step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Orbits**: The question states that an electron is jumping from the fourth orbit (n=4) to the second orbit (n=2).

2. **Understand Spectral Series**: In atomic physics, when an electron transitions between energy levels (or orbits), it emits or absorbs a photon. The series of spectral lines produced by these transitions are categorized into different series:
- **Lyman Series**: Transitions to n=1 (ground state).
- **Balmer Series**: Transitions to n=2.
- **Paschen Series**: Transitions to n=3.
- **Brackett Series**: Transitions to n=4.
- **Pfund Series**: Transitions to n=5.

3. **Determine the Series for the Transition**: Since the electron is moving from n=4 to n=2, we need to identify which series this transition belongs to. The transition from a higher energy level (n=4) to n=2 corresponds to the Balmer series, as it involves a transition to the second energy level.

4. **Conclusion**: Therefore, when an electron jumps from the fourth orbit to the second orbit, it emits a photon that corresponds to the Balmer series.

5. **Final Answer**: The answer to the question is that the transition from n=4 to n=2 corresponds to the **Balmer series**.