Question

The transition from the state `n = 4` to `n = 3` in a hydrogen-like atom results in ultraviolet radiation. Infared radiation will be obtained in the transition
A. `2 rarr 1`
B. ` 3 rarr 2`
C. `4 rarr 2`
D. ` 5 rarr 2`

Answer 1

Correct Answer - D
As the transition `n = 4` and `n = 3`, results in `UV` radiation and infrared radiation involves smaller amounts of enegry `UV`. So we require a transition involving initial values of `n` greater than `4` e.g. `5 rarr 4`.