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Question:

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 n=3 to n=1.

3→2

4→2

4→3

2→1

Solution:

Infrared radiation found in Paschen, Bracket and Fund series and it is obtained when electron transition is from a high energy level to minimum 3rd energy level.