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

Options

A. `(h)/(pi)`
B. `2pih`
C. `(2h)/(pi)`
D. `(pi)/(h)`

Answer

A

Explanation

According to bohr's second postulate
Angular momentum `L=(nh)/(2pi)` Angular momentum is also called a moment of momentum.
For second orbit, `n=2`
`L=(2h)/(2pi)=(h)/(pi)`