Predict which of the following statements are true or false.
Paschen, Brackett and Pfund series fall in infra red region.

Answer

To determine whether the statement "Paschen, Brackett, and Pfund series fall in the infrared region" is true or false, we can analyze each series based on their transitions and the regions of the electromagnetic spectrum they occupy.

### Step-by-Step Solution:

1. **Understanding the Series**:
- The hydrogen emission spectrum consists of several series based on electron transitions between energy levels.
- The main series to consider are:
- Lyman series
- Balmer series
- Paschen series
- Brackett series
- Pfund series

2. **Identifying Regions**:
- **Lyman Series**: Transitions from higher energy levels to n=1 (ground state) fall in the ultraviolet region.
- **Balmer Series**: Transitions from higher energy levels to n=2 fall in the visible region.
- **Paschen Series**: Transitions from higher energy levels to n=3 fall in the infrared region.
- **Brackett Series**: Transitions from higher energy levels to n=4 also fall in the infrared region.
- **Pfund Series**: Transitions from higher energy levels to n=5 also fall in the infrared region.

3. **Conclusion**:
- Since Paschen, Brackett, and Pfund series all involve transitions that end at n=3, n=4, and n=5 respectively, and all these transitions fall in the infrared region, we can conclude that the statement is **True**.

### Final Answer:
The statement "Paschen, Brackett, and Pfund series fall in the infrared region" is **True**.

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