Approximately a third of people with normal hearing have ears that continuously emit a low-intensity sound outward through the earcanal. A person with such spontaneous otoacoustic emission is rarely aware of the sound, except perhaps in a noise-free environment,but occasionally the emission is loud enough to be heard by someone else nearby. In one observation, the sound wave had a frequencyof 1692 Hz and a pressure amplitude of 1.17 x 10 Pa. What were (a) the displacement amplitude and (b) the intensity of the waveemitted by the ear? The air density is 1.21 kg/m3 and the speed of sound is 343 m/s.Units(a) NumberUnits(b) Number

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Answered: Approximately a third of people with…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Doppler ultrasound uses ultrasound to measure blood flow velocities. Suppose that the device emits sound at a frequency of 3.2MHz, and that the speed of sound in human tissue is 1540 m/s). What is the expected pulse rate if blood flows in the arteries of the large leg at a speed of 3 em/s away from the source of the sound? 1260Hz 126Hz 12.6Hz 12.6KHz 126KHz 1260KHz O 1.26MHz
Problem 9: One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren which produces a frequency of fs = 438 Hz.Randomized Variables vS = 34 m/sf = 438 Hz Part (a) What frequency (in Hertz) does the driver of the truck hear?Numeric : A numeric value is expected and not an expression.fd = __________________________________________Part (b) What frequency (in Hertz) does an observer hear when the truck is moving away?Numeric : A numeric value is expected and not an expression.fo = __________________________________________ Problem 10: A student knows that an ambulance siren has a frequency of fs = 395 Hz. He measures, when the ambulance is approaching him, the frequency fo = 416 Hz. Assume the speed of sound is 343 m/s in this problem. Part (a) Input an expression for the ambulance's speed, vs, in terms of the frequencies and the speed of sound v.Expression :vs =…
Recent research has shown that the use of earbud-style headphones packaged with MP3 players can cause permanent hearing loss. (a) The intensity of the sound from the speakers of a certain MP3 player (without earbuds) is measured at 3.8 x 10-5 w/m2. Find the decibel level. (Round your answer to the nearest whole number.) dB (b) If earbuds are used with the MP3 player in part (a), the decibel level is 90 dB. Find the intensity. (Round your answer to three decimal places.) W/m2 (c) Find the ratio of the intensity of the sound from the MP3 player with earbuds to that of the sound without earbuds. (Round your answer to one decimal place.)
102 kg/m3? What is the speed of sound in benzene, which has a bulk modulus of 1.05 x 109 Pa and a density of 8.76 x 1094.82 km/s
The following five problems should be calculated on paper, scanned or photographed, and submitted for credit. Convert the following sound pressures to sound pressure levels: p = 20 Pa p = 1 Pa p = 2 x 10-5 Pa Convert the following sound pressure levels to sound pressure: Lp = 80 dB Lp = 15 dB
A speaker puts out a constant sound with a power of P = 15 milliwatts and frequency fs = 256 Hz. Find: the frequency (fo) you’d hear if the speaker approached you at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if you approached the speaker at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if it moved away from you at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if you moved away from it at vs = 28 m/s (take the speed of sound to be v = 343 m/s)
Sound intensity D (decibels) is measured relative to the lowest human–detectable sound I0 = 10–12 W m–2. D = 10 log (I/I0) What is the relative intensity from a jet with I = 9.5 × 102 W m–2 ? D = 95 D = 150 D = 15
A cylinder completely filled with an unknown liquid has a radius of 1.50 cm, a length of 64.0 cm, and a mass of 357 g. An engineer performs an experiment to measure the speed of sound in the liquid. A small speaker emits a sound pulse at one end of the cylinder, which travels through the liquid and is detected by a microphone attached at the other end. The elapsed time between emission of the sound pulse and its detection by the microphone is measured by an electronic circuit to be 5.90 x 10-4 s. What the bulk modulus (in Pa) of the liquid in the cylinder? 3714 x What is the speed of sound in the material? How is it related to the bulk modulus and density of the material? What is the volume of a cylinder? Be careful with units in your calculations. Pa Need Help? Read It Submit Answer
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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12 gives the loudness of sound L (in dB) based on the intensity of sound I (in W/m²). The value I = 10 The formula L=10 log threshold for hearing for midfrequency sounds. Hearing impairment is often measured according to the minimal sound level (in dB) detected by an individual for sounds at various frequencies. For one frequency, the table depicts the level of hearing impairment. Category Mild Moderate Moderately severe Severe Profound Loudness (dB) 26≤L≤40 41≤L≤55 56≤L≤70 71 ≤L≤90 L>90 W/m is the minimal (a) If the minimum intensity heard by an individual is 9421.4 x 108 W/m², determine if the individual has a hearing impairment. Round to the nearest tenth. (b) If the minimum loudness of sound detected by an individual is 40 dB, determine the corresponding intensity of sound.
A sound wave has an intensity level of 121.3 dB in air. The density of air at 20.0°C is ρ = 1.20 kg/m3 (see Table 9.1). The speed of sound in air at 20.0°C is v = 343 m/s (see Table 12.1). What is the pressure amplitude of the wave?

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