Single frequency- phase and group velocity?

  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. Simon Bridge

    Simon Bridge 15,474
    Science Advisor
    Homework Helper
    Gold Member

    You mean in general or in the case of a single frequency in a vacuum?
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