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Chapter 17: Q. 59 (page 486)
Two in-phase loudspeakers emit identical 1000 Hz sound waves along the x-axis. What distance should one speaker be placed behind the other for the sound to have an amplitude 1.5 times that of each speaker alone?
The distance would be 7.99 cm.
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A 1.0-m-tall vertical tube is filled with C water. A tuning fork vibrating at 580 Hz is held just over the top of the tube as the water is slowly drained from the bottom. At what water heights, measured from the bottom of the tube, will there be a standing wave in the tube above the water?
In 1866, the German scientist Adolph Kundt developed a
technique for accurately measuring the speed of sound in various gases. A long glass tube, known today as a Kundt鈥檚 tube, has a vibrating piston at one end and is closed at the other. Very finely ground particles of cork are sprinkled in the bottom of the tube before the piston is inserted. As the vibrating piston is slowly moved forward, there are a few positions that cause the cork particles to collect in small, regularly spaced piles along the bottom. FIGURE P17.53 shows an experiment in which the tube is filled with pure oxygen and the piston is driven at 400 Hz. What is the speed of sound in oxygen?
Two in-phase loudspeakers, which emit sound in all directions,
are sitting side by side. One of them is moved sideways by 3.0 m, then forward by 4.0 m. Afterward, constructive interference is
observed and of the distance between the speakers along the line that joins them. What is the maximum possible wavelength of the sound waves?
A 280 Hz sound wave is
directed into one end of the
trombone slide seen in FIGURE
CP17.77. A microphone
is placed at the other end to
record the intensity of sound
waves that are transmitted
through the tube. The straight
sides of the slide are 80 cm in length and 10 cm apart with a
semicircular bend at the end. For what slide extensions s will the
microphone detect a maximum of sound intensity?
Two loudspeakers emit sound waves along the x-axis. A listener in front of both speakers hears a maximum sound intensity when speaker 2 is at the origin and speaker 1 is at x = 0.50 m. If speaker 1 is slowly moved forward, the sound intensity decreases and then increases, reaching another maximum when speaker 1 is at x = 0.90 m.
a. What is the frequency of the sound? Assume vsound = 340 m/s.
b. What is the phase difference between the speakers?
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