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Homework Help: Particles in an energy eigenstate not moving?

  1. Apr 17, 2010 #1
    1. The problem statement, all variables and given/known data

    I'm really struggling with this one guys, the question is:

    Explain why a particle which is in an energy eigenstate cannot be moving in the
    classical sense.

    2. Relevant equations

    I'm guessing the TISE and TDSE are relevant

    3. The attempt at a solution
  2. jcsd
  3. Apr 17, 2010 #2


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    Homework Helper
    Gold Member

    "Moving in the Classical sense" means that the expectation value of the particle's speed is non-zero. So, try calculating that expectation value for a particle in an energy eigenstate...
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