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Chapter 16: Q. 26 (page 452)
A 440 Hz sound wave in 20°C air propagates into the water of a swimming pool. What are the wave’s (a) frequency and (b) wavelength in the water?
Part a
The frequency of the wave is .
Part b
The wavelength of the sound wave in water is.
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What are the amplitude, wavelength, frequency, and phase constant of the traveling wave in FIGURE Q16.7?
Draw the history graph D(x = 0 m, t) at x = 0 m for the wave shown in FIGURE EX16.5.
Show that the displacement , where c and d are constants, is a solution to the wave equation. Then find an expression in terms of c and d for the wave speed.
You are standing at x = 0 m, listening to a sound that is emitted at frequency . The graph of FIGURE Q16.12 shows the frequency you hear during a 4-second interval. Which of the following describes the sound source? Explain your choice.
A. It moves from left to right and passes you at t = 2 s.
B. It moves from right to left and passes you at t = 2 s.
C. It moves toward you but doesn’t reach you. It then reverses direction at t = 2 s.
D. It moves away from you until t = 2 s. It then reverses direction and moves toward you but doesn’t reach you
The sound intensity 50 m from a wailing tornado siren is
.
a. What is the intensity at 1000 m?
b. The weakest intensity likely to be heard over background noise is . Estimate the maximum distance at
which the siren can be heard.
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