If radiation of all wavelengths from ultraviolet to infrared ispassed through hydrogen gas at room temperature absorption lines will be observed in the

Options

A. Lymann series
B. Balmer series
C. Both (A) and (B)
D. Neighter (A) nor (B)

Explanation

To solve the question regarding the absorption lines observed when radiation of all wavelengths is passed through hydrogen gas at room temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Hydrogen Atom Structure**:
- The hydrogen atom consists of a single electron orbiting around a nucleus (proton). The energy levels of the electron are quantized and are denoted by quantum numbers (n = 1, 2, 3,...).

2. **Identifying the Initial State**:
- When hydrogen gas is at room temperature, the electrons are primarily in the ground state, which corresponds to the lowest energy level (n = 1).

3. **Absorption of Radiation**:
- When radiation of all wavelengths (from ultraviolet to infrared) is passed through hydrogen gas, the electrons can absorb photons of specific energies that match the energy difference between their current state and a higher energy state.

4. **Possible Transitions**:
- The electron in the ground state (n = 1) can absorb energy and transition to higher energy levels (n = 2, n = 3, etc.). The transitions from n = 1 to n = 2, n = 1 to n = 3, and so on, are possible.

5. **Identifying the Series**:
- The transitions from n = 1 to higher levels (n = 2, n = 3, etc.) correspond to the Lyman series. The Lyman series consists of transitions where the final energy level is n = 1.

6. **Conclusion**:
- Therefore, when radiation is passed through hydrogen gas, absorption lines will be observed in the Lyman series due to the transitions of electrons from n = 1 to higher energy levels.

### Final Answer:
Absorption lines will be observed in the **Lyman series**.

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