The Lyman series of hydrogen spectrum lies in the region :

Options

A. from a particular higher energy level to n = 3
B. from a particular higher energy level to n = 2
C. from a particular higher energy level to n = 1
D. from a particular higher energy level to n = 4

Answer

To solve the question regarding the region of the Lyman series of the hydrogen spectrum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Lyman Series**:
- The Lyman series is a set of spectral lines in the ultraviolet region of the hydrogen spectrum. It corresponds to electronic transitions from higher energy levels (n ≥ 2) down to the first energy level (n = 1).

2. **Identify the Formula**:
- The wavelength (λ) of the emitted radiation during these transitions can be calculated using the Rydberg formula:
\[ \frac{1}{\lambda} = R \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \]
- Here, \( R \) is the Rydberg constant (approximately \( 1.097 \times 10^7 \, \text{m}^{-1} \)), \( n_1 \) is the lower energy level (1 for Lyman series), and \( n_2 \) is the higher energy level (2, 3, 4, ...).

3. **Set Values for Lyman Series**:
- For the Lyman series, we set \( n_1 = 1 \) and \( n_2 \) can take values of 2, 3, 4, etc. This means transitions occur from these higher levels down to n = 1.

4. **Determine the Region**:
- The wavelengths calculated for the transitions in the Lyman series fall within the ultraviolet (UV) region of the electromagnetic spectrum. The UV region is generally considered to be from about 10 nm to 400 nm.

5. **Conclusion**:
- Therefore, the Lyman series of the hydrogen spectrum lies in the ultraviolet region.

### Final Answer:
The Lyman series of hydrogen spectrum lies in the ultraviolet region.