Question

According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be .

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

Answer 1

Answer: (C)

$\frac{h}{\pi}$

Answer 2

Angular momentum $L = n\left( \frac{h}{2\pi} \right)$

For this case n=2, hence $L = 2 \times \frac{h}{2\pi} = \frac{h}{\pi}$.