<r> of hydrogen atom in ground state

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Using the ground state of the hydrogen atom
Psi 1,0,0 = sqrt([pi]*a3) * e-r/a

I get <r> the expected radius as <r> = 3a/2 where a = Bohr radius.

Anybody happen to know if this correct?

It would have been cooler if the Bohr radius in physical constants were <r> and the scale factor were in Psi 1,0,0.
 
Yes, your value is correct.
 

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