The Inverse Square Law
Hi, I have a hard time understanding the concept of the Inverse Square Law, and hence, answering this question. Please help!
The inverse square law for the intensity of light explains why we cannot pick up city radio stations in the country side. A radio station broadcasts at a frequency of 105.7 MHz. Their main office broadcasts at an intensity of 1.98x104 Wbm-2 (Assume intensity is at 1.0m distance).
a) How long would the radio signal take to travel to another city which is 32km away from their main office?
b) What is the wavelength of the radio station's waves?