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Question

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
21
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B
32
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C
42
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D
54
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Solution

The correct option is D 54
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.

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