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Chapter 16: Q. 66 (page 453)
An AM radio station broadcasts with a power of 25 kW at a
frequency of 920 kHz. Estimate the intensity of the radio wave at a point 10 km from the broadcast antenna.
The intensity of the radio wave is
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A wave has angular frequency 30 rad/s and wavelength 2.0 m.
What are its (a) wave number and (b) wave speed?
The wave speed on a string under tension is 200 m/s. What is the speed if the tension is halved?
FIGURE Q16.9 shows the wavefronts of a circular wave. What is the phase difference between
(a) points A and B,
(b) points C and D, and
(c) points E and F?
Show that the displacement D(x, t) = ln(ax + bt) , where a and b are constants, is a solution to the wave equation. Then find an expression in terms of a and b for the wave speed.
A loudspeaker on a tall pole broadcasts sound waves equally in all directions. What is the speaker’s power output if the sound intensity level is 90 dB at a distance of 20 m?
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