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Homework Help: QM question

  1. May 1, 2006 #1
    A wave function psi = 3i|up> + 1|down> corresponding to the spin of the electron.

    If I want to draw the distribution of the measured outcome, do I do the following?

    Probability of spin up = 0.9

    Probability of spin down = 0.1

    So I would draw a bar graph showing that spin up has a value of 0.9 and spin down have a value of 0.1. Is this right?
    Last edited: May 1, 2006
  2. jcsd
  3. May 1, 2006 #2


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    Yes. Since it is a discrete variable, the only way to plot the probabaility distribution is as a bar chart.
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