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## Homework Statement

Calculate the expected value for r^2 for the 2s wavefunction of the hydrogen atom (only the radial part of the function is needed for l=0). If you choose to solve this problem graphically, plot or sketch the function you integrate.

## Homework Equations

R(r)=1/sqrt(2a^3)*(1-r/2a)*e^(-r/2a) where a=bohr radius

## The Attempt at a Solution

to calculate, i know you integrate (from 0 to inf) as follows: int((R(r))^2*r^2 dr),

but i'm having trouble solving the integral. I'm not sure how I would solve it graphically either.

Any help is appreciated. Thanks