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What is the menaing of standing plane waves ?

  1. Aug 11, 2006 #1
    What is the menaing of "standing plane waves"?

    Hi All,

    For me, English is my second language and I am not good is waves also.

    Here is a passage from QM: "For all practical boundary conditions, the waves must be standing plane waves of all possible wavelengths and amplitudes"

    What is the significant of saying "standing plane waves"? Author could have waves or plane waves but I think he is trying to convey by saying "standing plane waves".

    Any help will be appreciated.
  2. jcsd
  3. Aug 11, 2006 #2
    they're just plane waves that don't propagate but rather appear to stand still.
  4. Aug 11, 2006 #3


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    Staff: Mentor

    An example of a standing plane wave whose planes are parallel to the xy-plane (i.e. perpendicular to the z-axis) is

    [tex]\psi(x, y, z, t) = A \cos (kz) \exp (i \omega t)[/tex]
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