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Homework Help: Question about waves

  1. Nov 16, 2008 #1
    Why is it that the amplitude of an harmonic spherical wave decreases with increasing r, while this is not the case for an harmonic plane wave?
  2. jcsd
  3. Nov 16, 2008 #2
    I don't know what those are, but maybe the spherical wave spreads its energy in all directions, while the plane wave conserves the energy by moving in 1 direction.
  4. Nov 16, 2008 #3
    That's right spherical waves are moving in all directions as we define it spherical coordinates.But plane waves like sound are move in 1 direction and go towards that direciton.
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