The hydrogen -like species `Li^(2+)` is in a spherically symmetric state `S_(1)` with one node. Upon absorbing light , the ion undergoes transition to a state `S_(2)`. The state `S_(2)` has one radial node and its energy is equal is to the ground state energy of the hydrogen atom.
The orbital angular momentum quantum number of the state `S_(2)` is

Options

A. `1 s`
B. `2 s`
C. `2 p`
D. `3 s`

Answer

B

Explanation

For lower state `(S_(1))`
No. of radial node `=1=n-l-1`
Put `n=2` and `l=0` (as higher state `S_(2)` has `n=3)`
So, it would be `2s` (for `S_(1)` state)