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Chapter 17: Q2PE (page 629)
What frequency sound has a 0.10 m wavelength when the speed of sound is 340 m/s?
The frequency is f = 3400 Hz
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Dolphins make sounds in air and water. What is the ratio of the wavelength of a sound in air to its wavelength in seawater? Assume air temperature is .
Elephants and whales are known to use infrasound to communicate over very large distances. What are the advantages of infrasound for long distance communication?
(a) At an air show a jet flies directly toward the stands at a speed of\({\rm{1200}}\;{\rm{km/h}}\), emitting a frequency of\({\rm{3500}}\;{\rm{Hz}}\), on a day when the speed of sound is\({\rm{342}}\;{\rm{m/s}}\). What frequency is received by the observers? (b) What frequency do they receive as the plane flies directly away from them?
Is 155dB ultrasound in the range of intensities used for deep heating? Calculate the intensity of this ultrasound and compare this intensity with the values quoted in the text.
How does an unamplified guitar produce sounds so much more intense than those of a plucked string held taut by a simple stick?
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