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Does the mod square of the wave function always have to be real?

  1. Jun 28, 2014 #1
    1. The problem statement, all variables and given/known data
    Doing a bit of QM from Griffiths intro to QM and got stuck early on on the following worked example:

    http://imgur.com/6aPVGIr

    I was under the impression that the mod square of the wave function ψ(x,t) should always be a positive, real number, but I cannot understand where the isin(2πt/h(E2-E1)) has gone in the last line. Perhaps I'm missing some simplification using trig identities perhaps?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jun 28, 2014 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    In the next to last equality of the example, there is a product of two expressions in parentheses. Show us what you get when you multiply this out.
     
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