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Emission and Absorption Spectra

Number of spe...

Question

Number of spectral lines in Balmer series when an electron return from $7^{t h}$ orbit to $1^{s t}$ orbit of hydrogen atom are:

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 D $5$
Balmer series $n_{1} = 2$ and $n_{2} = 7$

Hence, Number of spectral lines $= n_{2} - n_{1} = 7 - 2 = 5$

So, the correct option is $C$

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