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Chapter 17: Q68P (page 510)
The shock wave off the cockpit of the FA 18 in Figure has an angle of aboutThe airplane was traveling at aboutwhen the photograph was taken. Approximately what was the speed of sound at the airplane鈥檚 altitude?
The speed of the sound at airplane鈥檚 altitude is
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The sixth harmonic is set up in a pipe. (a) How many open ends does the pipe have (it has at least one)? (b) Is there a node, antinode, or some intermediate state at the midpoint?
Question: A friend rides, in turn, the rims of three fast merry-go-roundswhile holding a sound source that emits isotropically at a certain frequency. You stand far from each merry-go-round. The frequency you hear for each of your friend鈥檚 three rides varies as the merry-go-round rotates. The variations in frequency for the three rides aregiven by the three curves in Fig. 17-29. Rank the curves according to:
(a) the linear speed vof the sound source, (b) the angular speedsvofthe merry-go-rounds, and (c) the radii rof the merry-go-rounds, greatest first
Question: A listener at rest (with respect to the air and the ground) hears a signal of frequency from a source moving toward him with a velocity of 15 m / s, due east. If the listener then moves toward the approaching source with a velocity of, due west, he hears a frequencythat differs fromby 37 Hz. What is the frequency of the source? (Take the speed of sound in air to be).
Question: A handclap on stage in an amphitheater sends out sound waves that scatters from terraces of width W 0.75 mfigure. The sound returns to the stage as a periodic series of pulses, one from each terrace; the parade of pulses sounds like a played note (a)Assuming that all the rays in figure are horizontal , find the frequency at which the pulses return(that is ,the frequency of the perceived note .(b)If the widthof the terraces were smaller would the frequency be higher or lower?
Question: Figure 17-28 shows a moving sound source S that emits at a certain
frequency, and four stationary sound detectors. Rank the detectors
according to the frequency of the sound they detect from the
source, greatest first.
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