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Hydrogen Spectra

Atomic hydrog...

Question

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

\frac{1}{2} n (n - 1)

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\frac{1}{2} n (n + 1)

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n (n + 1)

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n (n - 1)

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Solution

The correct option is B $\frac{1}{2} n (n - 1)$
Maximum no of spectral lines $= \frac{n (n - 1)}{2}$

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