The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultra violet radiation. Infrared radiation will be obtained in the transition. (IIT-JEE-2001)
A
2→1
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B
3→2
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C
4→2
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D
5→4
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Solution
The correct option is D5→4 Infrared radiation has a higher wavelength and hence lower energy as compared to the ultraviolet radiation. So, a transition with energy difference less than the n=4 to n=3 transition will result in infrared. Looking at the options, n=5 to n=4 is the correct answer.