A communication satellite transmits a continuous power of uniformly through a…
PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A communication satellite transmits a continuous power of 100W uniformly through a circular opening of radius 0.50m, producing an approximately plane electromagnetic wave in the forward direction. Assume the wave has fully expanded into a cylindrical beam of the same radius when it is 1.0km away from the opening.
(i) Calculate the intensity (power per unit area) of the wave at this distance.
(ii) Determine the root-mean-square (rms) value of the electric field of the wave at this point.
(iii) Find the corresponding rms magnetic field value.