Sound from a car has a frequency of 800 Hz. If a person is stationary and the car is moving away from him at 20 m/s, estimate the frequency os sound heard by the person.
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A: The sound intensity level at r1 = 0.5 m is β1 = 107 dB
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Q: If the sound level of one barking dog is 70 dB, estimate the sound level of 76 dogs barking…
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A: distance (d) = 4 m Power of fan (P) = 50 W Io = 10-12 Wm2
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- If the sound level of one barking dog is 40 dB, estimate the sound level of 2 dogs barking simultaneously in the same place.A sound source with a frequency of 1800 Hz is moved 24 m/s away from a reflecting wall that also moves away from the source at 26 m/s. If the speed of sound is 343 m/s determine the frequency that the source of the reflected wave detects.A bat at rest sends out ultrasonic sound waves at 50.0 ? Hz and receives them returned from an object moving directly away from it at 28.5 ?/?. What is the received sound frequency?
- A sound source with a frequency of 1700 Hz moves at 50 m / s towards a wall reflector that moves away from the source at 55 m / s. If the speed of sound is 343 m / s determine the frequency that detects the source of the reflected wave.A rock band creates a sound intensity level of 111 dB at a distance of 20.0 m. (a) Calculate the sound intensity. W/m2 (b) Assuming sound from the amplifiers travels as a spherical wave, what average power do the amplifiers generate?cicadas produce a buzzing aound that has a wavelength in te air of 2.69 m . If the spped of the sound in air is 346m/s , what is the frequency of teh sound produced by a cicada? what is its period?