In Fig. 17-53, a point source S of sound waves lies near a reflecting wall AB . A sound detector D intercepts sound ray R 1 , traveling directly from S . It also intercepts sound ray R 2 that reflects from the wall such that the angle of incidence θ i is equal to the angle of reflection θ r . Assume that the reflection of sound by the wall causes a phase shift of 0.500 λ . If the distances are d 1 =2.50 m. d 2 = 20.0 m. and d 3 = 12.5 m. what are the (a) lowest and (b) second lowest frequency at which R 1 , and R 2 are in phase at D ? Figure 17-53 Problem 109.
In Fig. 17-53, a point source S of sound waves lies near a reflecting wall AB . A sound detector D intercepts sound ray R 1 , traveling directly from S . It also intercepts sound ray R 2 that reflects from the wall such that the angle of incidence θ i is equal to the angle of reflection θ r . Assume that the reflection of sound by the wall causes a phase shift of 0.500 λ . If the distances are d 1 =2.50 m. d 2 = 20.0 m. and d 3 = 12.5 m. what are the (a) lowest and (b) second lowest frequency at which R 1 , and R 2 are in phase at D ? Figure 17-53 Problem 109.
In Fig. 17-53, a point source S of sound waves lies near a reflecting wall AB. A sound detector D intercepts sound ray R1, traveling directly from S. It also intercepts sound ray R2 that reflects from the wall such that the angle of incidence θi is equal to the angle of reflection θr. Assume that the reflection of sound by the wall causes a phase shift of 0.500λ. If the distances are d1 =2.50 m. d2 = 20.0 m. and d3 = 12.5 m. what are the (a) lowest and (b) second lowest frequency at which R1, and R2 are in phase at D?
A sound wave arriving at your ear is transferred to the fluid in the cochlea. If the intensity in the fluid is 0.410 times that in air and the frequency is the same as for the wave in air, what will be the ratio of the pressure amplitude of the wave in air to that in the fluid? Approximate the fluid as having the same values of density and speed of sound as water. Speed of sound in dry air (20.0°C, 1.00 atm) is 343 m/s, density of dry air (at STP) is 1.29 kg/m3, density of water is 1000 kg/m3, and speed of sound in water is 1493 m/s.
Example 14-8 depicts the following scenario. Two people relaxing on a deck listen to a songbird sing. One person, only 1.66 m from the bird, hears the sound with an intensity of 2.86×10−6 W/m^2.
A bird-watcher is hoping to add the white-throated sparrow to her "life list" of species. How far could she be from the bird described in example 14-8 and still be able to hear it? Assume no reflections or absorption of the sparrow's sound.
A 2 kHz sound wave traveling in the x direction in air was observed to have a differential pressure p(x,t) = 10 N/m2 at x = 0 and t = 50 μs.
If the reference phase of p(x,t) is 36o, find a complete expression for p(x,t). The velocity of sound in air is 330 m/s.
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