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The transition from the state n = 3 to n = 1 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from:

1. 2 → 1
2. 3 → 2
3. 4 → 2
4. 4 → 3

Correct answer: 4 → 3

Solution

Infrared radiation corresponds to lower energy transitions. The transition from n = 4 to n = 3 involves a smaller energy difference compared to other options, making it infrared.

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