While driving down the road, you spot a friend standing on the sidewalk. You honk your horn at them while driving 60 km/h. Your horn emits a frequency of 330 Hz. V sound = : 343 m/s a. What frequency does your friend hear as you approach? 347 Hz b. What frequency does your friend hear after you pass by? 315 Hz
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A: The sound intensity level of the engine, β=140 dB The threshold intensity, I0=10-12 W/m2
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A: Pressure amplitude (P) = 0.5 Pa density (d) = 1.2 kgm3Speed of sound (v) = 343 ms
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A: f=nT=813.7 s=0.58 Hz Speed of wave v=0.58 Hz1.45 m=0.84 m/s
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- 7. On a given day, the speed of sound in air is 3434m/s. As an emergency vehicle approaches you, youhear a tone that is 1200Hz. That type of emergency vehicle has a siren that emits a tone that is 1050Hz.(a) What is the speed of the vehicle? (b) As it drives away from you, what tone do you hear?30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?Resonances of the ear canal lead to increased sensitivity of hearing, as we've seen. Dogs have a much longer ear canal-5.2 cm-than humans. What are the two lowest frequencies at which dogs have an increase in sensitivity? The speed of sound in the warm air of the ear is 350 m/s. A 1700 Hz, 3400 Hz B. 1700Hz, 5100Hz C. 3400 Hz, 6800 Hz D. 3400 Hz, 1 0,200 Hz
- 3. The VE3KBR transmitter near Tokyo broadcasts on a frequency of 146.940 MHz. The transmitter is broadcasting a test sound that is picked up by a nearby amateur radio. The test sound has a frequency of 1 kHz and a wavelength of 33 cm. a) What is the wavelength of the transmitter’s radio wave (in metres)? b) What is the speed of the sound wave that is coming out of the radio (in m/s)?Two loudspeaker are separated by 2.5 m. A person stands at 3.0 m from one and at 3.5m from the other one. Assume a sound velocity of 343 m/s. A.what is the minimum frequency to present constructive interference at this point? B.calculate the other two frequencies that also produce constructive interference?I'm not sure how to solve this type of problem. Detailed steps would be very helpful, please. The intensity of a sound wave is 100 W/m2 at a distance of 3 m. a. What is the intensity of the sound wave at a distance of 6 m? b. What is the intensity at 9 m?
- 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 train passes by an little boy at the depot As it moves away from the boy at 65 m/s, the whistle emits a frequency of 4500hz. What frequency docs the little boy hear as the train barrcs off into the distance. Spced of sound in air is 343m/'s 1.5357.14 2. 5552.2 hz 3.4500hz 4.3783 hz 5.3647,26 hzThe highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound in air at this frequency? 2. What is the wavelength of the lowest sounds we can hear, about 20 HzHz?
- The Wanamaker Pipe Organ in Macy's Center City department store in Philadelphia is the largest working pipe organ in the world. The organ occupies a seven- story hall, and has the longest pipe length of 9.75 m that occupies four floors and can be used as either an open or a closed pipe. Assume that the speed of sound is 345 m/s. a. Calculate the lowest fundamental frequency for the Wanamaker Pipe Organ. b. The highest note on an 88-key piano is 4186 Hz. What would be the length of a pipe open on one end that produced this as a fundamental frequency?The sound pressure amplitude associated with a 120 db loudness is Group of answer choices a. much lower than 1.0 atm b. much higher than 1.0 atm c. about equal to 1.0 atm.A train at rest blows a whistle to alert passengers that it is about to depart from a subway station. The pitch of this whistle is 1.14 × 104 Hz. The speed of sound in the air in that subway tunnel is 342 m/s. The speed of sound in iron is 5130 m/s. a. What is the wavelength of that sound in the air? b. Assuming that the sound was loud enough to be heard from the end of the 1200 m long tunnel, when was it heard through air? through the rails?