Q. The transition from the state $n$=4 to $n$=3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
A) 2 $\rightarrow 1$
B) 3$\ \rightarrow 2$
C) 4$\ \rightarrow 2$
D) 5$\ \rightarrow 3$
Explanation
(d) Infrared radiation corresponds to least value of $\left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right)$ ,$ie$, from Paschen, Brackett and Pfund series. Thus the transition corresponds to 5$\ \rightarrow 3.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.