Using the dispersion equation, show that the group velocity is given by for high-frequency electromagnetic waves (e.g.,
Question:
show that the group velocity is given by
for high-frequency electromagnetic waves (e.g., X-rays). Keep in mind that since Æj are the weighting factors, ΣjÆj = 1. What is the phase velocity? Show that vvg c2.
Transcribed Image Text:
Nq. n°(w) = 1 + fj Com, < V g 1 + Nq²/eomw²2 ||
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