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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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a) What is the speed of sound in a medium where a 100 kHz frequency produces a 5.96 cm wavelength? (b) Which substance in Table 17.1 is this likely to be?
(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.
It is more difficult to obtain a high-resolution ultrasound image in the abdominal region of someone who is overweight than for someone who has a slight build. Explain why this statement is accurate.
Six members of a synchronized swim team wear earplugs to protect themselves against water pressure at depths, but they can still hear the music
and perform the combinations in the water perfectly. One day, they were asked to leave the pool so the dive team could practice a few dives, and they tried to practice on a mat but seemed to have a lot more difficulty. Why might this be?
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