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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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if a large housefly\(3.0\;{\rm{m}}\)away from you makes a noise of\(40.0\;{\rm{dB}}\), what is the noise level of\(1000\)flies at that distance, assuming interference has a negligible effect?
A person has a hearing threshold \({\rm{10 dB}}\) above normal at \({\rm{100 Hz}}\) and \({\rm{50 dB}}\) above normal at \({\rm{4000 Hz}}\). How much more intense must a \({\rm{100 Hz}}\) tone be than a \({\rm{4000 Hz}}\) tone if they are both barely audible to this person?
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 .
A spectator at a parade receives an\(888\;{\rm{Hz}}\)tone from an oncoming trumpeter who is playing an\(880\;{\rm{Hz}}\)note. At what speed is the musician approaching if the speed of sound is\({\rm{338}}\;{\rm{m/s}}\)?
A commuter train blows its\(200\;{\rm{Hz}}\)horn as it approaches a crossing. The speed of sound is\(335\;{\rm{m/s}}\). (a) An observer waiting at the crossing receives a frequency of\(208\;{\rm{Hz}}\). What is the speed of the train? (b) What frequency does the observer receive as the train moves away?
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