Chapter 2: Q5DQ (page 496)
For the wave motions discussed in this chapter, does the speed of propagation depend on the amplitude? What makes you say this?
No
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Two loudspeakers, and , are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is . You are from role="math" localid="1655809995061" . What is the closest you can be to and be at a point of destructive interference?
Consider a sound wave in air that has displacement amplitude 0.0200 mm. Calculate the pressure amplitude for frequencies of (a) 150 Hz; (b) 1500 Hz; (c) 15,000 Hz. In each case compare the result to the pain threshold, which is 30 Pa.
Tsunami! On December 26, 2004 , a great earthquake occurred off the coast of Sumatra and triggered immense waves (tsunami) that killed some 200,000 people. Satellites observing these waves from space measured 800 km from one wave crest to the next and a period between waves of 1.0 hour . What was the speed of these waves in m/s and in km/hr? Does your answer help you understand why the waves caused such devastation?
Does an aircraft make a sonic boom only at the instant its speed exceeds Mach 1? Explain.
As we discussed in Section 15.1, water waves are a combination of longitudinal and transverse waves. Defend the following statement: “When water waves hit a vertical wall, the wall is a node of the longitudinal displacement but an antinode of the transverse displacement.”
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