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Chapter 24: Q18CQ (page 887)
Your friend says that more patterns and colors can be seen on the wings of birds if viewed in ultraviolet light. Would you agree with your friend? Explain your answer.
I agree with your friend.
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Some radar systems detect the size and shape of objects such as aircraft and geological terrain. Approximately what is the smallest observable detail utilizing\(500{\rm{ }}MHz\)radar?
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
Find the intensity of an electromagnetic wave having a peak magnetic field strength of .
On its highest power setting, a microwave oven increases the temperature of 0.004 kgof spaghetti by in 120 s. (a) What was the rate of power absorption by the spaghetti, given that its specific heat isrole="math" localid="1655872138905" ? (b) Find the average intensity of the microwaves, given that they are absorbed over a circular area 20.0 cmin diameter. (c) What is the peak electric field strength of the microwave?(d) What is its peak magnetic field strength?
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).
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