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Chapter 17: Q1CQ (page 628)
How do sound vibrations of atoms differ from thermal motion?
Heat(thermal motion) creates random movements in atoms whereas sound causes vibration in atoms in a particular direction.
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What is the length of a tube that has a fundamental frequency of176 Hzand a first overtone of352 Hzif the speed of sound is 343 m/s?
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) What is the intensity in watts per meter squared of a just barely audible \({\rm{200 Hz}}\) sound? (b) What is the intensity in watts per meter squared of a barely audible \({\rm{4000 Hz}}\) sound?
Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a\(90.0\;{\rm{dB}}\)sound intensity level for a\({\rm{12}}{\rm{.0}}\;{\rm{cm}}\)diameter speaker that has an efficiency of\(1.00\% \). (This value is the sound intensity level right at the speaker.)
Can you perceive the shift in frequency produced when you pull a tuning fork toward you at\({\rm{10}}{\rm{.0}}\;{\rm{m/s}}\)on a day when the speed of sound is \({\rm{344}}\;{\rm{m/s}}\)? To answer this question, calculate the factor by which the frequency shifts and see if it is greater than\({\rm{0}}{\rm{.300\% }}\).
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