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QM integration question

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if i want to calculate mean square radius by using:
[tex]
\rho^2=\frac{\int \mid\psi\mid^2 r^2 dr}{\int |\psi|^2 dr}
[/tex]
with [itex]\psi=\sum_{k} a_k exp(ikr)[/itex].

How do I solve the numerator part?
 
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Answers and Replies

  • #2
CarlB
Science Advisor
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Have you considered integrating by parts?

Carl
 

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