a) A sound wave moves through the air. Its frequency is 522.32 Hz. The air temperature is 11 °C. Calculate to the nearest tenth of a meter per second, the velocity of the sound on air. b) The frequency changes to 1090.7 Hz. The air temperature reminds 11 °C. Calculate to the nearest tenth of a meter per second, the velocity of the sound on air.
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- Going down the road at 65 miles per hour on a 86.0 °F summer day, Bari heard a siren approaching. Bari knows that a police siren's frequency is 1280.0 Hz, but it didn't sound like that. Bari pulled over a lane, without slowing down, after seeing the flashing lights of the police car coming up from behind, and the police passed going 25 miles per hour faster than Bari was going. (1 mile = 1.60 km) a) what was the speed of sound on that warm summer day? b) How fast, in m/s, was the police car going? c) What frequency did Bari hear from the siren before the police car passed? d) What frequency did Bari hear from the siren after the police care had passed?dolphins make sounds in air and water. What is the ratio of the wavelength λa of a sound in air at sea level to its wavelength λs in seawater if the speed of sound in water at that specific location is 1530 m/s and the air temperature is 10.00 ∘C? λa/λs=A sound wave traveling in 22 °C air has a sound intensity of 25 × 10-3 W/m2 Part (a) Assuming the density of air at this temperature is 1.19 kg/m3, what is the pressure variation of this sound wave in N/m2? Part (b) Calculate the sound intensity level in decibels.
- The sound level at a distance d=34 m from a loudspeaker is 70 dB. What is the power (in Watt) at which sound energy is being produced by the loudspeaker?. The threshold of hearing, lo = 1*10-12 W/m2, A. 0.5265 B. 0.3812 C. 0.1453 D. None E. 0.5812A sound wave travels from air (Z 413 kg m2 s1) to a liquid with a density of (950 kg m3) and a speed of sound in it (1-cm s 75000). 1) What percentage of the wave is reflected at the boundary? 2) What percentage of the wave travels across the boundary?3. A bystander hears a siren vary in frequency from 598 Hz to 364 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s f60 ss f60 s ssfo ssf60 s
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- Thank you! The fundamental frequency of an organ pipe, closed at one end, is 258.3 Hz. a) What should the length of this organ pipe be? Speed of sound in air at T= 20.0°C is 343 m/s b) What is the fundamental frequency of this organ pipe if the temperature drops to 5.20°C?Determine the wavelength of the sound for 24 Hz. Determine the wavelength of the sound for 23 kHz.While taking off, a jet engine emits 132.0 W of sound power as it reaches a height of 97 m. A small microphone with a 1.00 cm^2 area is on the ground directly below the jet. a) What is the sound intensity at the position of the microphone? b) What is the sound intensity level at the position of the microphone? c) How much sound energy impinges on the microphone in 4.0 s?