In a sample of `H-` atom electrons make transition from `5^(th)` excited state to ground state, producing all possible types of photons, then number o

Monjur Alahi

In a sample of `H-` atom electrons make transition from `5^(th)` excited state to ground state, producing all possible types of photons, then number of lines in infrared region are
A. `4`
B. `5`
C. `6`
D. `3`


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Correct Answer - C
Infrared lines =total lines -visible lines -UV lines `=(6(6-1))/(2)-4-5 =15-9=6`
`("visible lines" =4 6 rarr2, 5 rarr2, 4 rarr 2, 3 rarr 2)` " " `("UV lines" =5 6 rarr1, 5rarr 1, 4 rarr 1, 3 rarr 1, 2 rarr1)`

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