Number of possible spectral lines in the bracket series in hydrogen spectrum, when electrons present in the ninth excited state return to the ground state, is

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Question

Prashant Kotian · Accepted Answer

Correct answer: D. Ninth excited state = n=10. Brackett series ends at n_1=4. Possible initial states: n=5,6,7,8,9,10 → 10-4 = 6 lines.

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