Question

12. Use the equation midv/dt +v/t)=-eE for the electron drift velocity, v, to show that the conductivity at frequency, o is (0)= 1+ior 1+(or) Here a = ne' t/m is the DC conductivity. ii. What is plasma and what is meant by plasma frequency? Explain why satellites use the microwave range of frequencies for communication. For a frequency of 50 Gigahertz, what is the corresponding free space wavelength?

Answer 1

Q. Answer mr du mc+) -CE -16 since, we know J=oE & Ja-nev E= -nev mo m(-iw + £ 10 = - nev (t=2} [1+-we)] = nec = ne²c m (1-iwel on = net ( (ltiway I ci-iwel (1 tiwal 6 6 (1 tiwe 6 2 nez Itiwe 1+ (w212 where so = nee so o (6) = Colitiwe I +(we)?

(ii) Actually, the Plasma is the fourth state of matter. Since, a plasma is an iconized gas, a a gas into which sufficient energy is provided to free elections from atom or molecules and to allow bath species, ions and elections, to coexist. The fre blasma frequency (cop) con be expressed as; when e = relaxation time n = number dersity. in 1 Actually the satellite use the micromanen range frequencies for communication. Because it is longer wavelength and its propagate more than visible and Infrared. mare dength (3) = C = 3x108 = 6 mmeter = 6mm Im=103
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