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Atomic hydrogen is excited to the n^(th)...

Atomic hydrogen is excited to the `n^(th)` energy level . The maximum number of spectral lines which it can emit while returning to ground state, is:

A

`(1)/(2)n(n-1)`

B

`(1)/(2)n(n+1)`

C

`n(n+1)`

D

`n(n+1)`.

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The correct Answer is:
A
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