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Homework Help: Laplace of plane wave

  1. Jun 28, 2012 #1
    This is what I got for Nabla and Laplace of plane wave. I have problems when I try to write out it with x, y, z coordinates. Can somebody help me? Thanks!

    http://img213.imageshack.us/img213/9532/85490316.jpg [Broken]

    http://img528.imageshack.us/img528/6835/f41cab97f649df5431127b5.png [Broken]
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Jun 28, 2012 #2
    What problems do you have? You should get the same thing, just written in terms of the components of [itex]k[/itex] and [itex]r[/itex].
  4. Jun 28, 2012 #3

    I know the result, but I have problems with procedure. Can you write down this equation; or just the start? Thanks!
  5. Jun 28, 2012 #4
    What's [itex]k \cdot r[/itex] when written in terms of cartesian coordinates?
  6. Jun 28, 2012 #5
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