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Question

Find the maximum number of spectral lines in Balmer series when an electron returns from the 7th orbit to the 1st orbit in a sample of hydrogen atoms.

A
5
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B
6
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C
21
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D
15
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Solution

The correct option is A 5
Maximum number of spectral lines (N) corresponding to transition from n1=7 to n2=1 are:
N= number of lines emitted =12(n1n2)(n1n2+1)
=12(71)(71+1)
=21
From total spectral lines, lines falling in Balmer series is
five (72,62,52 , 42 and 32).
Number of transitions in Balmer series =5

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