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Single frequency- phase and group velocity?

  1. Feb 21, 2013 #1
    Let's consider a single frequency signal of frequency say 'f'. If the wave is propagating through a medium (EM wave with a velocity of 'c') then what will be the phase and group velocity? I believe that we can't find out the phase velocity and that the group velocity should be equal to the velocity of light 'c'.

    Can you tell me a specific example where these phase and group velocities are really useful?

    Thanks in advance.
     
  2. jcsd
  3. Feb 21, 2013 #2

    Simon Bridge

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