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## Main Question or Discussion Point

[itex]

\langle p\rangle=-i\hbar\int \Psi^*\frac{\partial}{\partial x}\Psi dx

[/itex]

Apparently, in general, we get a complex number for momentum. What does it mean, since p is an observable?

\langle p\rangle=-i\hbar\int \Psi^*\frac{\partial}{\partial x}\Psi dx

[/itex]

Apparently, in general, we get a complex number for momentum. What does it mean, since p is an observable?