# Expectation value of P for an infinite-square well

by jmm5872
Tags: expectation, infinitesquare
 P: 43 I just have a simple question to get me started. If I am given an initial value wavefunction ψ(x,0) and I am asked to find

at t = 0 can I use this:

= -ih∫ψ*(x,0)$\frac{∂}{∂x}$ψ(x,0)dx or do I need to find ψ(x,t) before I find

?

 P: 52 No you are right (h bar)

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