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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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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?
What sound intensity level in dB is produced by earphones that create an intensity of \(4.00 \times {10^{ - 12}}\;{\rm{W/}}{{\rm{m}}^{\rm{2}}}\)?
What frequency sound has a 0.10 m wavelength when the speed of sound is 340 m/s?
What is the difference between an overtone and a harmonic? Are all harmonics overtones? Are all overtones harmonics?
(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?
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