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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?

[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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