GO In Fig. 17-46, sound of wavelength 0.850 m is emitted isotropically by point source S . Sound ray 1 extends directly to detector D , at distance L = 10.0 m. Sound ray 2 extends to D via a reflection (effectively, a “bouncing”) of the sound at a flat surface. That reflection occurs on a perpendicular bisector to the SD line, at distance d from the line. Assume that the reflection shifts the sound wave by 0.500 λ . For what least value of d (other than zero) do the direct sound and the reflected sound arrive at D (a) exactly out of phase and (b) exactly in phase? Figure 17-46 Problem 79.
GO In Fig. 17-46, sound of wavelength 0.850 m is emitted isotropically by point source S . Sound ray 1 extends directly to detector D , at distance L = 10.0 m. Sound ray 2 extends to D via a reflection (effectively, a “bouncing”) of the sound at a flat surface. That reflection occurs on a perpendicular bisector to the SD line, at distance d from the line. Assume that the reflection shifts the sound wave by 0.500 λ . For what least value of d (other than zero) do the direct sound and the reflected sound arrive at D (a) exactly out of phase and (b) exactly in phase? Figure 17-46 Problem 79.
GO In Fig. 17-46, sound of wavelength 0.850 m is emitted isotropically by point source S. Sound ray 1 extends directly to detector D, at distance L = 10.0 m. Sound ray 2 extends to D via a reflection (effectively, a “bouncing”) of the sound at a flat surface. That reflection occurs on a perpendicular bisector to the SD line, at distance d from the line. Assume that the reflection shifts the sound wave by 0.500λ. For what least value of d (other than zero) do the direct sound and the reflected sound arrive at D (a) exactly out of phase and (b) exactly in phase?
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.
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What is the speed of sound in benzene, which has a bulk modulus of 1.05 x 10^9 Pa and a density of 8.76 x 10^2 kg/m^3?
For a 171Hz plane traveling wave in air with a sound pressure level of 40 dB re 20 pPa, find (a)the acoustic pressure amplitude, (b) the intensity, (c)the acoustic particle speed amplitude, (d) the acoustic density amplitude, (e) the particle displacement amplitude
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