Question
An AM radio transmitter broadcasts 50.0 kW of power uniformly in all directions. (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity 30.0 km away? (Hint: Half the power will be spread over the area of a hemisphere.) (b) What is the maximum electric field strength at this distance?
1. $4.42 \times 10^{-6} \textrm{ W/m}^2$
2. $5.77 \times 10^{-2} \textrm{ N/C}$
Solution Video