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Chapter 24: Q20CQ (page 887)
Give an example of energy carried by an electromagnetic wave.
An example is the microwave oven.
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In which situation shown in Figure\({\rm{24}}{\rm{.24}}\)will the electromagnetic wave be more successful in inducing a current in the wire? Explain.
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?
If the Sun suddenly turned off, we would not know it until its light stopped coming. How long would that be, given that the Sun isaway?
How do fluorescent soap residues make clothing look “brighter and whiter” in outdoor light? Would this be effective in candlelight?
Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0.250mW. (a) If such a laser beam is projected onto a circular spot 1.00mm in diameter, what is its intensity? (b) Find the peak magnetic field strength. (c) Find the peak electric field strength.
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