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Homework Help: Kittel page 112

  1. Mar 21, 2008 #1
    1. The problem statement, all variables and given/known data
    This question refers to Kittel's solid-state physics book.

    Above equation (23), Kittel says that a cutoff frequency [itex]\omega_D[/itex] is determined by (19) as" and then he gives equation (23). I have absolutely no idea where equation (23) comes from.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 24, 2008 #2
    Could you reproduce the equations for those of us who don't have the book handy?
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