The photon radiated from hydrogen corresponding to the second line of Lyman series is absorbed by a hydrogen like atom X in the second excited state. Then, the hydrogen-like atom X makes a transition of nth orbit.

Options

A. `X = He^(+) , n = 4`
B. `X = Li^(+ +) , n = 6`
C. `X = He^(+) , n = 6`
D. `X = Li^(+ +) , n = 9`

Answer

D

Explanation

Energy of `n ^(th)` state in hydrogen is same as to `3 n ^(th)` state in `L i^(+ +)`.
3 to 1 transition in H would give same energy as the ` 3 xx 3` to `1 xx 3` i.e. , 9 to 3 transition in `L i^(+ +)`.