Using the dispersion equation, show that the group velocity is given by for high frequency electromagnetic waves (e g , X rays) Keep in mind that since AElig j are the weighting factors, Icirc pound j AElig j 1 What is the phase velocity Show that vv g c 2 Nq n(w) 1 fj Com, V g 1 Nq eomw2

Question: Using the dispersion equation, show that the group velocity is given by for high-frequency electromagnetic waves (e.g., X-rays). Keep in mind that since Æ j

Using the dispersion equation,

Nq. n°(w) = 1 + fj Com, <

show that the group velocity is given by

V g 1 + Nq²/eomw²2 ||

for high-frequency electromagnetic waves (e.g., X-rays). Keep in mind that since Æ’_j are the weighting factors, Î£_jÆ’_j = 1. What is the phase velocity? Show that vv_g‰ˆ c².

Nq. n(w) = 1 + fj Com, < V g 1 + Nq/eomw2 ||

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