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Homework Help: Expectation value for a spin-half particle.

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Calculate the expectation value of the operator [tex]_{}Sz[/tex] for a spin-half particle known to be in an eigenstate of the operator [tex]_{}Sz[/tex]

    2. Relevant equations

    3. The attempt at a solution

    I know the eigenvalues for the [tex]_{}Sz[/tex] but how can I find the expectation values from this?
  2. jcsd
  3. Nov 12, 2009 #2


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    Homework Helper
    Gold Member

    You might start with the definition of expectation value (in equation form)....:wink:
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