In a sample of H-atom electrons make transition from 5th excited state to ground state, producing al

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In a sample of H-atom electrons make transition from 5th excited state to ground state, producing all possible types of photons, then number of lines in infrared region are

Accepted Answer

infrared lines = total lines - visible lines - UV lines = - 4 - 5 = 15 - 9 = 6.
(visible lines = 4 6 → 2, 5 → 2, 4 → 2, 3 → 2) (UV lines = 5 6 → 1, 5 → 1, 4 → 1, 3 → 1, 2 → 1)

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