Question

According to Bohr's theory, the angular momentum of an electron in $5^{th}$ orbit is:

• A. $2.5h/\pi$
• B. $25h/\pi$
• C. $1.0h/\pi$
• D. $10h/\pi$

Answer 1

The correct option is A $2.5h/\pi$

Expression for angular momentum is written as, $L=\frac{nh}{2\pi }$.

For $5^{th}$ orbit $,n=5$.

$L=\frac{5h}{2\pi }=\frac{2.5h}{\pi }$

Hence, option A is correct.