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Homework Help: Plasma: Wave and Phase difference

  1. Dec 8, 2011 #1

    I need someone to rephrase the question or tell me what it is actually asking for because I am not sure I understand it clearly:

    Consider a plasma slab of width L. k_0 is the wave number in a vacuum, and k in the wave number in the plasma, where k satisfies the dispersion relation:
    \frac{ck}{\omega} = \left( 1-\frac{\omega^2_{pe}}{\omega^2}\right)^{1/2}
    where c is speed of light, ω the wave frequency and ω_pe the electron plasma frequency.

    Question: Determine the phase of the wave at x=L when n=n_e0 = constant, relative to the phase of the wave traveling the same distance L in a vacuum.

    Should I start with 2 plane waves, one in vacuum and one traveling through the plasma, where I would assume that the second has a phase phi and determine the latter?

    Any clarification would be much appreciated.
  2. jcsd
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