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Homework Help: Expectation value of P for an infinite-square well

  1. Mar 6, 2012 #1
    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 <P> at t = 0 can I use this:

    <P> = -ih∫ψ*(x,0)[itex]\frac{∂}{∂x}[/itex]ψ(x,0)dx

    or do I need to find ψ(x,t) before I find <P>?
  2. jcsd
  3. Mar 7, 2012 #2
    No you are right (h bar)
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