Atomic StructureHard
Question
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
Options
A.4
B.5
C.6
D.3
Solution
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)
- 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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