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

A. $\frac{1}{2} n (n - 1)$

B. $\frac{1}{2} n (n + 1)$

C. $n (n - 1)$

D. $n (n + 1)$

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Correct Answer : A.

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