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Question

When electrons in sample of H-atom make transitions from 5th excited state to ground state, then the maximum number of spectral lines which belong to visible region is:

A
10
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B
4
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C
15
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D
5
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Solution

The correct option is A 10
Given,

Electron is in 5th excited state,
n2=6

Electron dexcite to visible region,
n1=2

Now,
Number of spectral lines =(n2n1)(n2n1+1)2
=(62)(62+1)2
=4×52
=10

Hence, option A is correct.


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