What is the intensity of an electromagnetic wave with a peak electric field strength of 125 V/m?
An outdoor WiFi unit for a picnic area has a 100-mW output and a range of about 30 m. What output power would reduce its range to 12 m for use with the same devices as before? Assume there are no obstacles in the way and that microwaves into the ground are simply absorbed.
A 150-W lightbulb emits of its energy as electromagnetic radiation. What is the magnitude of the average Poynting vector 10.0 m from the bulb?