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Question

Number of visible lines when an electron returns from 5th orbit to 2nd orbit in H-spectrum:

A
5
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B
4
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C
3
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D
10
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Solution

The correct option is C 3
Spectral lines corresponding to the visible frequencies/wavelength belong to the Balmer series. This happens when an electron falls from a higher energy level to the level corresponding to n=2.

When an electron transits from n=5 to n=2, there are 3 possible lines in visible region with transitions:
25, 24, and 23

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