JEE MAIN - Physics (2009 - No. 6)
The transition from the state $$n=4$$ to $$n=3$$ in a hydrogen like atom result in ultra violet radiation. Infrared radiation will be obtained in the transition from :
$$3 \to 2$$
$$4 \to 2$$
$$5 \to 4$$
$$2 \to 1$$
Explication
It is given that transition from the state $$n=4$$ to $$n=3$$ in a hydrogen like atom result in ultraviolet radiation. For infrared radiation the energy gap should be less. The only option is $$5$$ $$ \to 4.$$