Mean value of momentum of electron in H atom

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Homework Statement


What is the mean value of the momentum of an electron of a hydrogen atom in its ground state? Derive this mean value of the momentum from the kinetic energy of the electron.


Homework Equations


<p> = integral from -infinity to infinity (p*|psi|^2) dx
p^2/2m = KE



The Attempt at a Solution


I solved the equation above for p; p = sqrt(2m*KE). <p> = integral from -infinity to infinity [sqrt(2m*KE)*|psi|^2]dx, but I don't know where to go from here.

Thanks.
 

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