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Question

How many Balmer spectral lines will be obtained when the excited electrons return from 8th shell to 2nd shell?

A
21
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B
4
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C
10
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D
15
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Solution

The correct option is A 21
The general formula for calculating number of spectral lines
= (nHnL)(nHnL+1)2
Here Balmer line means transition from 8th shell to 2nd shell
nH=8, nL=2
Number of spectral lines=(82)(82+1)2
=(6)(7)2
=21

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