Using the dispersion equation, show that the group velocity is given by for high-frequency electromagnetic waves (e.g.,
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show that the group velocity is given by
for high-frequency electromagnetic waves (e.g., X-rays). Keep in mind that since Æ’j are the weighting factors, ΣjÆ’j = 1. What is the phase velocity? Show that vvg ‰ˆ c2.
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