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For a 3s - orbital, value of Psi is give...

For a 3s - orbital, value of `Psi` is given by following realation:
`Psi(3s)=(1)/(9sqrt(3))((1)/(a_(0)))^(3//2)(6-6sigma+sigma^(2))e^(-sigma//2)," where " sigma=(2r.Z)/(3a_(0))`
What is the maximum radial distance of node from nucleus?

A

`((3+sqrt(3))a_(0))/(Z)`

B

`(a_(0))/(Z)`

C

`(3)/(2)((3+sqrt(3))a_(0))/(Z)`

D

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

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