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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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In Figure, is a small loudspeaker driven by an audio oscillator with a frequency that is varied from, andis a cylindrical pipe with two open ends and a length of. The speed of sound in the air-filled pipe is (a) At how many frequencies does the sound from the loudspeaker set up resonance in the pipe? What are the (b) lowest and (c) second lowest frequencies at which resonance occurs?
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?
(a) If two sound waves, one in air and one in (fresh) water, are equal in intensity and angular frequency, what is the ratio of the pressure amplitude of the wave in water to that of the wave in air? Assume the water and the air are at . (See Table 14-1.)
(b) If the pressure amplitudes are equal instead, what is the ratio of the intensities of the waves?
Figure shows two isotropic point sources of sound and The sources emit waves in phase at wavelength 0.50m; they are separated by . If we move a sound detector along a large circle centered at the midpoint between the sources, at how many points do waves arrive at the detector(a) Exactly in phase and (b) Exactly out of phase ?
Question: A man strike one end of a thin rod with a hammer. The speed of sound in the rod is 15times the speed of sound in the air. A woman, at the other end with her ear close to the rod, hears the sound of the blow twice with a 0.12 sinterval between; one sound comes through the rod and the other comes through the air alongside the rod. If the speed of sound in air is 343 m/swhat is the length of the rod?
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