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Emission and Absorption Spectra

No of spectra...

Question

No of spectral lines in Balmer series when an electron return from 7 th orbit to 1st 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 A 5
Number of spectral lines emitted in any particular series is $(n_{2} - n_{1}) = 7 - 2 = 5$

It should be noted that $n_{2} = 7$ and $n_{1}$ of balmer series is always 2.

Hence, the correct option is $A$

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