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The schrodinger wave equation for hydrog...

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

A

`(a_(0))/(2)`

B

`2a_(0)`

C

`sqrt(2)a_(0)`

D

`(a_(0))/(sqrt(2))`

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