Question

What is the angular momentum of an electron in the fourth orbit of Bohr’s model of hydrogen atom?

• A. $\frac{h}{2\pi }$
• B. $\frac{2h}{\pi }$
• C. h
• D. $\frac{h}{4\pi }$

Answer 1

Answer: (B)

Angular momentum in any stationary orbit
is mvr = $\frac{nh}{2\pi }$for 4${}^{th}$orbit,n=4
$\Rightarrow$ mvr v = $\frac{4h}{2\pi }$