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For 2s orbital , Psi(r) = (1)/(sqrt(8))(...

For 2s orbital , `Psi_(r) = (1)/(sqrt(8))((z)/(a_(0)))^((3)/(2))(2-(zr)/(a_(0)))e^((zr)/(2a_(0)))` then , hydrogen radial node will be at the distant of

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`psi_(2s)=1/(2sqrt(2pi))[1/(a_(0))]^(1//2)[2-r/(a_(0))]e^(-r//2a_(0))`
For radia node at `r=r_(0),phi_(2s)^(2)=0`. This is possible only when `[2-(r_(0))/(a_(0))]=0`
`:.r_(0)=2a_(0)`
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