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Estimate the Debye frequency?

  1. Dec 12, 2011 #1
    This is a short question from an old final exam I'm studying from.

    If you're given the graph of the dispersion curves for some material (I attached an example, but pretend the axes have numerical values on them), how would I go about estimating the Debye frequency?

    My initial thought was just to approximate it as the maximum frequency on that graph, and although that gives a fairly close result, my professor says it's not quite the right approach.

    Please help!

    (NB: the lettering in the image stands for transverse optical, longitudinal optical, transverse acoustic, longitudinal acoustic.)
     

    Attached Files:

  2. jcsd
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