The schrodinger wave equation for hydrogen atom is `Psi_2 = (1)/(4sqrt(2pi))((1)/(a_0))^(3//2) (2-(r)/(a_0))e^(-r//a_0)` where `a_0` is Bohr.s radius. If the radial node in 2s be at `r_0` would be equal to

Options

A. `(a_0)/(2)`
B. `2a_0`
C. `sqrt2 a_0`
D. `(a_0)/(sqrt2)`

Answer

B

Explanation

At radial node `varphi^2 = 0,2 - r/(a_0) =0 , r=2a_0`