Question

An electron in 2nd orbit gains energy and goes to 4th orbit. What is the difference in angular momentums experienced by the electron due to the transition?

Answer 1

Angular momentum at n=$4\Rightarrow \frac{4h}{2\pi }$

Angular momentum at n=$2\Rightarrow \frac{2h}{2\pi }$

Change in angular momentum=$\frac{4h}{2\pi }-\frac{2h}{2\pi }=\frac{h}{\pi }$