According to Bohr's theory, when an electron jumps from any higher orbit to the third orbit, spectral lines are emitted. These are called

Options

A. Lyman series
B. Balmer series
C. Paschen series
D. Plund series

Answer

To solve the question regarding the spectral lines emitted when an electron jumps from a higher orbit to the third orbit according to Bohr's theory, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Bohr's Theory**: Bohr's theory of the hydrogen atom states that electrons occupy specific orbits or energy levels around the nucleus. When an electron transitions between these orbits, it can emit or absorb energy in the form of light.

2. **Identify the Orbits**: The orbits are labeled by a principal quantum number (n). The first orbit corresponds to n=1, the second to n=2, the third to n=3, and so on.

3. **Determine the Transition**: The question specifies that the electron is jumping from a higher orbit to the third orbit (n=3). This means the electron could be transitioning from n=4, n=5, or any higher orbit down to n=3.

4. **Recognize the Series**: According to the nomenclature of spectral series:
- When an electron transitions to n=1, it emits light in the Lyman series.
- When it transitions to n=2, it emits in the Balmer series.
- When it transitions to n=3, it emits in the Paschen series.
- For n=4, it is the Brackett series.
- For n=5, it is the Pfund series.

5. **Identify the Correct Series**: Since the question specifically asks about the transition to the third orbit (n=3), the series that corresponds to this transition is the Paschen series.

6. **Select the Answer**: Based on the above information, the correct answer to the question is the Paschen series.

### Final Answer:
The spectral lines emitted when an electron jumps from any higher orbit to the third orbit are called the **Paschen series**.

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