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Chapter 24: Q30PE (page 889)
What is the intensity of an electromagnetic wave with a peak electric field strength of 125V/m?
The intensity is.
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Why don鈥檛 buildings block radio waves as completely as they do visible light?
Electromagnetic radiation having a \(15.0\mu m\)wavelength is classified as infrared radiation. What is its frequency?
(a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared) fromof the Earth鈥檚 surface at night. Assume the emissivity is 0.90,0.90 ,the temperature of the Earth islocalid="1655871883893" , and that of outer space is 2.7 K. (b) Compare the intensity of this radiation with that coming to the Earth from the Sun during the day, which averages about, only half of which is absorbed. (c) What is the maximum magnetic field strength in the outgoing radiation, assuming it is a continuous wave?
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?
Give an example of energy carried by an electromagnetic wave.
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