what is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n=4 to and energy level with n=2 ?

Explanation

To find the wavelength of light emitted when an electron in a hydrogen atom transitions from an energy level with \( n = 4 \) to an energy level with \( n = 2 \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Energy Levels**:
- The initial energy level (higher energy) is \( n_2 = 4 \).
- The final energy level (lower energy) is \( n_1 = 2 \).

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