Question

The angular momentum of electron can have the value(s):

• A. $0.5\frac{h}{\pi }$
• B. $\frac{h}{\pi }$
• C. $\frac{h}{0.5\pi }$
• D. $2.5\frac{h}{2\pi }$

Answer 1

Answer: (A), (B), (C)

The correct options are
A $0.5\frac{h}{\pi }$
B $\frac{h}{\pi }$
C $\frac{h}{0.5\pi }$

Angular momentum of electron $mvr=nh/2pi$ where n is integer. So A, B and C are possible.
The important postulates on which Bohr's Model is based are the following :
Atoms have a nucleus where all protons and neutrons are present.
The size of the nucleus is very small and it is present at the centre of the atom.
The attraction force (Coulombic or electrostatic force) between nucleus and electron is equal to the centrifugal force of the electron.
Electrons can revolve only in those orbits whose angular momentum ($mvr$) is an integral multiple of $\frac{h}{2\pi }$.