Consider a uniform plane time-harmonic electromagnetic wave of frequency/traveli
ID: 2077715 • Letter: C
Question
Consider a uniform plane time-harmonic electromagnetic wave of frequency/traveling through an arbitrary lossy medium of parameters elementof, mu and a. The phase velocity of this wave, u_p, is a constant, equal to 3 times 10^8 m/s. a constant different from 3 x 108 m/s. function of frequency. Given the frequencies at which electromagnetic waves can and cannot propagate through it, plasma x (ionized gas such as in ionospehere) behaves like a low-pass filter (only low frequencies pass). a high-pass filter (only high frequencies pass). a band-pass filter (specific range of frequencies pass). no filter at all. A uniform plane time-harmonic electromagnetic wave incident from the earth's surface normally on the ionosphere passes through it. bounces off it. completely absorbed. Need more information. Determine the type (linear, circular, or elliptical) of the polarization of an electromagnetic wave whose instantaneous electric field intensity vector is given by E(x, t) = [2cos(omega t + beta x) y - sin(omega t + beta x) z] V/m, where omega and beta are the angular frequency and phase coefficient of the wave The polarization of the wave is linear. circular. elliptical. Need more information.Explanation / Answer
9..for an electromagnetic wave phase velocity vp=c/n where n is index of refraction and not a function of f therefore the answer is (B)
10. In electromagnetic wave propagation through plasma the waves with lower frequencies cannot pass therefore answer is(B)
11 Ionosphere acts as a plasma or conducctor which reflects the waves back normal to it.
answer is(B)
12 EM waves regardless of theirvibration directio, they will movingg along linear direcction
Answer is (A)