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Nuclei
Question
The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
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2 → 1
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3 → 2
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4 → 2
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5→ 4
Solution
D.
5→ 4
IR corresponds to least value of 
i.e. from Paschen, Bracket and Pfund series. Thus the transition corresponds to 5 → 4
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