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Homework Help: Is this a typo?

  1. Nov 15, 2009 #1
    1. The problem statement, all variables and given/known data

    In my textbook, the formula for the expectation value is written as:

    [tex] <x> = \int \Psi^{*}\Psi dx [/tex]

    Shouldn't there be an [tex] x [/tex] next to [tex]|\Psi|^{2}[/tex] ?


    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 15, 2009 #2
    yes it should read

    [tex]<x>=<\psi|x|\psi> = \int_{-\infty}^{\infty}\psi^*x\psi dx[/tex]

    make sure you write it in this form too. Otherwise when you start putting in other operators like p you will get it wrong.
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