- #1
agingstudent
- 7
- 0
Homework Statement
I am trying to find the variance of p for a wave function [tex]\Psi[/tex](x,0)=A(a^2-x^2)
I'm confused about how to set up the integral.
it should be something like [tex]-i^2h^2\int_{-a}^a A(a^2-x^2) (\frac{\partial\Psi}{\partial x})^2 dx[/tex]
I'm confused about the partial derivative squared. My technique was to set up the integral like this:
[tex]hA^3\int_{-a}^a (a^2-x^2) (-2x^2)^2 dx[/tex] but I'm pretty sure my answer is way wrong. I don't know how to deal with the partial derivative. please help.