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Chapter 2: Q45E (page 541)
On the planet Arrakis a male ornithoid is flying toward his mate at while singing at a frequency of . If the stationary female hears a tone of , what is the speed of sound in the atmosphere of Arrakis?
Sound travels at a speed of .
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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?
Interference of Triangular Pulses. Two triangular wave pulses are traveling toward each other on a stretched string as shown in Fig. E15.32. Each pulse is identical to the other and travels at \(2.00\;{{{\rm{cm}}} \mathord{\left/ {\vphantom {{{\rm{cm}}} {\rm{s}}}} \right. \\} {\rm{s}}}\). The leading edges of the pulses are \(1.00\;{\rm{cm}}\) apart at \(t = 0\). Sketch the shape of the string at \(t = 0.250\;{\rm{s}}\), \(t = 0.500\;{\rm{s}}\), \(t = 0.750\;{\rm{s}}\), \(t = 1.000\;{\rm{s}}\), and \(t = 1.250\;{\rm{s}}\)
A turntable 1.50 m in diameter rotates at 75 rpm. Two speakers, each giving off sound of wavelength 31.3 cm, are attached to the rim of the table at opposite ends of a diameter. A listener stands in front of the turntable. (a) What is the greatest beat frequency the listener will receive from this system? (b) Will the listener be able to distinguish individual beats?
A piano wire with mass 3.00 g and length 80.0 cm is stretched with a tension of 25.0 N. A wave with frequency 120.0 Hz and amplitude 1.6 mm travels along the wire. (a) Calculate the average power carried by the wave. (b) What happens to the average power if the wave amplitude is halved?
At point A, 3.0 m from a small source of sound that is emitting uniformly in all directions, the sound intensity level is 53 db. (a) What is the intensity of the sound at A? (b) How far from the source must you go so that the intensity is one-fourth of what it was at A? (c) How far must you go so that the sound intensity level is one-fourth of what it was at A? (d) Does intensity obey the inverse-square law? What about sound intensity level?
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