Chapter 12: Q7MCQ (page 328)
When a sound wave passes from air into water, what properties of the wave will change?
(a) Frequency.
(b) Wavelength.
(c) Wave speed.
(d) Both frequency and wavelength.
(e) Both wave speed and wavelength.
The correct option is (e).
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You look directly overhead and see a plane exactly 1.45 km above the ground flying faster than the speed of sound. By the time you hear the sonic boom, the plane has traveled a horizontal distance of 2.0 km. See Fig. 12-38. Determine (a) the angle of the shock cone, \(\theta \), and (b) the speed of the plane and its Mach number. Assume the speed of sound is 330 m/s.
Determine the fundamental and first overtone frequencies when you are in a \({\bf{9}}{\bf{.0 - m}}\) long hallway with all doors closed. Model the hallway as a tube closed at both ends.
Question: (II) Estimate the frequency of the “sound of the ocean” when you put your ear very near a 15-cm-diameter seashell (Fig. 12–35).
Question: Each string on a violin is tuned to a frequency \({\bf{1}}\frac{{\bf{1}}}{{\bf{2}}}\) times that of its neighbor. The four equal-length strings are to be placed under the same tension; what must be the mass per unit length of each string relative to that if the lowest string?
Question: (II) (a) Estimate the power output of sound from a person speaking in normal conversation. Use Table 12-2. Assume the sound spreads roughly uniformly over a sphere centered on the mouth. (b) How many people would it take to produce a total sound output of 60 W of ordinary conversation? (Hint: Add intensities, not dBs.)
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