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Atomic hydrogen is excited to the nth en...

Atomic hydrogen is excited to the nth energy level . The maximum number of spectral lines which it can emit while returning to ground state,is:

A

`1/2n(n-1)`

B

`1/2n(n+1)`

C

`n(n+1)`

D

`n(n+1)`

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The correct Answer is:
A
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