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EM Frequency

  1. Apr 10, 2007 #1
    I was wondering, when an EM wave goes from one medium to another why is it that the frequency remains constant?
  2. jcsd
  3. Apr 10, 2007 #2


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    Staff: Mentor

    Last edited: Apr 10, 2007
  4. Apr 10, 2007 #3

    Claude Bile

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    The perpendicular component of the electric displacement vector D, must be equal at the boundary AT ALL TIMES to preserve continuity - this is only possible if the frequency of the wave on both sides of the boundary is the same.

  5. Apr 10, 2007 #4
    Makes sense. Thanks! :cool:
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