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Question

The ratio of energies of first two excited states hydrogen atom is ?

A
3/1
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B
1/4
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C
4/9
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D
9/4
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Solution

The correct option is D 9/4
Ground state or n=1 state has enegy E1=13.6eV
First excited state means n=2 so E2=E1/22=3.4eV
Second excited state means n=3 so E3=13.6/32=1.51eV
The ratio is 3.41.51=2.25=9/4 or simply 3222
Option D is correct.

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