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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.
Illustrate that the size of details of an object that can be detected with electromagnetic waves is related to their wavelength, by comparing details observable with two different types (for example, radar and visible light or infrared and X-rays).
Make a list of some everyday objects and decide whether they are transparent or opaque to each of the types of electromagnetic waves.
If you live in a region that has a particular TV station, you can sometimes pick up some of its audio portion on your FM radio receiver. Explain how this is possible. Does it imply that TV audio is broadcast as FM?
Figure 24.26 shows the interference pattern of two radio antennas broadcasting the same signal. Explain how this is analogous to the interference pattern for sound produced by two speakers. Could this be used to make a directional antenna system that broadcasts preferentially in certain directions? Explain
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