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What is a populated state?

  1. Jul 4, 2014 #1

    I was reading time-dependent perturbation on Sakurai and it mentioned that a certain state was "populated". What does that mean? I don't think it mentions it in any previous chapter.

    Thank you for your time.
  2. jcsd
  3. Jul 4, 2014 #2


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    Staff: Mentor

    There is a particle in the state.
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