Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar

    Staff: Mentor

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

    Claude Bile

    User Avatar
    Science Advisor

    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:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook