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Chapter 17: Q5PE (page 629)
Show that the speed of sound in air is 343 m/s , as claimed in the text.
The speed is343 m/s
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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?
A sound wave traveling in \(20\;{\rm{^\circ C}}\) air has pressure amplitude of\(0.5\;{\rm{Pa}}\). What is the intensity of the wave?
A diagnostic ultrasound echo is reflected from moving blood and returns with a frequency\({\rm{500 Hz}}\)higher than its original\({\rm{2}}{\rm{.00 MHz}}\). What is the velocity of the blood? (Assume that the frequency of\({\rm{2}}{\rm{.00 MHz}}\)is accurate to seven significant figures and\({\rm{500 Hz}}\)is accurate to three significant figures.)
What is the difference between an overtone and a harmonic? Are all harmonics overtones? Are all overtones harmonics?
Why can a hearing test show that your threshold of hearing is 0 at 250Hz , when Figure 17.37 implies that no one can hear such a frequency at less than 20dB?
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