When an excited hydrogen atom returned to its ground state, some visible quanta were observed along with other quanta. Which of the following transitions must have occurred ?

Options

A. `2 rarr 1`
B. `3 rarr 1`
C. `3 rarr 2`
D. `4 rarr 2`

Answer

A

Explanation

(a) Since some visible quanta were observed along with other quanta, electrons must have made transition from some higher state to `n = 2` and then from `n = 2 "to" n= 1`.
`:.` Transition from `2 rarr 1` is compulsory, because electron from `n = 2` will finally fall into `n = 1`.