The wave number of first emission line in the atomic spectrum of hydrogen in the Balmer series is

Question

The wave number of first emission line in the atomic spectrum of hydrogen in the Balmer series is, 5 R 36 c m - 1, 3 R 4 c m - 1, 7 R 144 c m - 1, 9 R 400 c m - 1

MARKS App · Accepted Answer

Balmer series starts from n = 2 . So first emission line in atomic spectrum of H is 2 → 3 1 λ = RZ 2 1 n 1 2 − 1 n 2 2 ν - = R 1 2 2 - 1 3 2 c m - 1 = 5 R 36 c m - 1

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