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  4. The total number of spectral lines expected to be emitted by atomic hydrozen excited to the 5th energy level:

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Q. The total number of spectral lines expected to be emitted by atomic hydrozen excited to the 5th energy level:

EAMCETEAMCET 1999

Solution:

Number of spectral lines emitted by atomic hydrogen atom is given as $ =\frac{n(n-1)}{2}=\frac{5(5-1)}{2} $ $ =10 $