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Bohr's Model of Atom

The number of...

Question

The number of spectral lines obtained in Bohr spectrum of hydrogen atom when an electron is excited from 2nd orbit to 5th orbit is :

A

3

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B

6

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C

10

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D

5

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Solution

The correct option is A 6
Number of spectral lines from n $_{1}$ to n $_{2}$ = $\frac{(n_{2} - n_{1} + 1) (n_{2} - n_{1})}{2}$ = $\frac{(5 - 2 + 1) (5 - 2)}{2}$ = 6
Option (B) is correct.

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