A satellite 589 km above the earth\'s surface transmits sinusoidal electromagnet

Question

A satellite 589 km above the earth's surface transmits sinusoidal electromagnetic waves of frequency 94.6 MHz uniformly in all directions, with a power of 24.0 kW. (a) What is the intensity of these waves as they reach a receiver at the surface of the earth directly below the satellite? (b) What are the amplitudes of the electric and magnetic fields at the receiver? (c) If the receiver has a totally absorbing panel measuring 17.0 cm by 37.0 cm oriented with its plane perpendicular to the direction the waves travel, what average force do these waves exert on the panel?

Explanation / Answer

I = P/A I = P/(4pi*r^2) A= 24000 / (4 * pi * 589000^2) = 5.505 * 10^(-9) W / m^2.

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