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 nth state in Hydrogen is same as energy of `3n_(th)` state in `Li++`
`:. 3 rarr1` transition in H would give
same energy as the `3 xx 3 rarr 1 xx 3`
transition in `Li++`