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24 pts. Phase and group velocity of a plasma. The permittivity ε of a plasma (ionized gas) is a function of frequency given b
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2. 2. (3) ohich is the required relation U3.w2 also forn(1) So eq uation (3) becomes Co 。Group velocity- p velegg _ Gaup velphaie velocy de es not Conespond to intemati on 0 ta on velo 1-0 Lo te. Fle fedia Lustop does nat pass thau h plasma as it auCivtn that 2 here tup a plasna fitqany (a) phasewelocutd-in plasma Plase velo cityH is datined as to in matlur IR ean (2) 2 L

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