The radius of an orbit in hydrogen atom is equal to

Options

A. `n^(2)h^(2)//4pi^(2)mZe^(2)`
B. `2pi Ze^(2)//nh`
C. `2pi^(2)mZ^(2)e^(4)//n^(2)h^(2)`
D. `-2pi^(2)mZ^(2)e^(2)//n^(2)h^(2)`

Answer

A

Explanation

radius `alpha n^(2), alpha(1)/(z^(2))`