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**1. Problem statement**

This isn't a homework question itself, but is related to one. More specifically, I'm computing the time-derivative of [tex]\langle x \rangle[/tex] using the correspondence principle. One side simplifies to [tex]\left\langle \frac{\hat{p}}{m} \right\rangle[/tex], but what is the physical meaning of this? How does one compute the expectation value of an

*operator*? The concept is alien to me.

**2. Homework Equations**

[tex]\langle Q \rangle = \int_{-\infty}^{\infty}\Psi^* \hat{Q} \Psi \; dx[/tex]

[tex]\langle \hat{Q} \rangle = ???[/tex]