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Hydrogen Spectra

The number of...

Question

The number of spectral lines that are possible when electrons in fourth energy level in different hydrogen atoms returns to the ground state is

A

4

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B

6

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C

8

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D

3

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Solution

The correct option is B
6

No of Spectral lines $= \frac{n (n - 1)}{2}$
$= \frac{4 (4 - 1)}{2} = 6$

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