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Line Spectra

Hydrogen atom...

Question

Hydrogen atom is excited from ground state to another state with principal quantum number equal to $4$ . Then the number of spectral lines in the emission spectra will be.

A

2

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B

3

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C

5

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D

6

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Solution

The correct option is A $6$
If $n = 4$ ,
Spectral lines will be $= \frac{n (n - 1)}{2} = 6$

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