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Probability of an observable

  1. Apr 23, 2012 #1

    How would you compute the probability of measuring a specific value of an observable (resp. range for continuous variables), given a wavefunction with an eigenbasis that is different from the one associated with the observable?

    An example: Let's consider my wave function is a superposition of energy-eigenfunctions, how would I get the probability of finding the momentum in a range [a,b]?

  2. jcsd
  3. Apr 23, 2012 #2


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    Science Advisor
    Gold Member

    1) Obtain the momentum representation wave function.

    2) Integrate its absolute square over the appropriate interval.
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