DMy 6. + -12 points YF14 32. P.035. A satellite 541 km above the earth\'s surfac
ID: 1776635 • Letter: D
Question
DMy 6. + -12 points YF14 32. P.035. A satellite 541 km above the earth's surface transmits sinusoidal electromagnetic waves of frequency 92.6 MHz uniformly in all directions, with a power of 30.0 kW. (a) What is the intensity of these waves as they reach a receiver at the surface of the earth directly below the satellite? ]w/m2 (b) what are the amplitudes of the electric and magnetic fields at the receiver? Emax = |N/C Bmax = (C) If the receiver has a totally absorbing panel measuring 13.0 cm by 35.0 cm oriented with its plane perpendicular to the direction the waves travel, what average force do these waves exert on the panel? Is this force large enough to cause significant effects? o Yes O NOExplanation / Answer
Pav = 30000 W
R = 541 km
(a) I = Pav/A = 30000/[4pi*(541)^2] = 0.0081567 W/m^2
(b) I = 0.5*eo*c*Emax2 ======> Emax = sqrt(2I/(eo*c)) = 2.48 N/C
Bmax = Emax/c = 2.48/(3*10^8) = 8.3*10^-9 T
(c) F = (I/c)*A = (0.0081567*0.13*0.35)/3*10^8 = 1.24*10^-12 N
The force is too weak to create any significant effect.
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