Question

Which of the following is NOT the possible angular orbital momentum of an electron?

$h$ is the Planck constant.

• A. $\frac{3h}{2\pi }$
• B. $\frac{5h}{2\pi }$
• C. $\frac{7h}{2\pi }$
• D. $\frac{8.5h}{2\pi }$

Answer 1

The correct option is D $\frac{8.5h}{2\pi }$

From postulates of Bohr’s Model, an electron can move only in those orbits for which its angular orbital momentum is an integral multiple of $\frac{h}{2\pi }$.

$\Rightarrow mvr=\frac{nh}{2\pi }$

Also, we know that, $8.5$ is not an integer.

Hence, option $\left(D\right)$ is the correct answer.