Question

Angular momentum of electron in the First Bohr orbit is :

• A. $0.1055\times {10}^{-34}Js$
• B. $2.10\times {10}^{-13}Js$
• C. $3.15\times {10}^{-13}Js$
• D. Can be $\left(A\right)$ or $\left(B\right)$

Answer 1

The correct option is A $0.1055\times {10}^{-34}Js$

Angular momentum of electron in $nth$ Bohr orbit $L_n=\frac{nh}{2\pi }$
For first Bohr orbit, $n=1$
Therefore, $L_1=\frac{h}{2\pi }=\frac{6.625\times {10}^{-34}}{2\times 3.14}=1.055\times {10}^{-34}Js$