A radio station broadcasts with a power of 50,000 watts. Estimate the average intensity of the...
A radio station broadcasts with a power of 50,000 watts. Estimate the average intensity of the wave at a distance of 50 km from the radio transmitting antenna. Assume for the purpose of this estimate that the antenna radiates equally in all directions, so that the intensity is constant over a hemisphere centered on the antenna.
Homework Answers
Apply I ntensity = P/A
The surface area of a sphere is 4pir^2, and so we have half a sphere. That is 2pir^2
I = 50000/2pi(50000)^2
I = 3.18 X 10^-6 W/m^2
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