A woman stands a distance d from a loud motor that emits sound uniformly in all directions. The sound intensity at her position is anuncomfortable 3.3x103 W/m². At a distance 3.2 times as far from the motor, what are (a) the sound intensity and (b) the soundintensity level relative to the threshold of Hearing?(a) Number i 0.00082(b) Number 89.03UnitsW/m 2UnitsdB+

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Answered: A woman stands a distance d from a loud…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 95P: Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes...

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Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00 m-1, an angular frequency of =2.50 s-1, and a period of 6.00 s, but one has a phase shift of an angle =12 rad. What is the height of the resultant wave at a time t=2.00 s and a position x=0.53 m?
Some studies suggest that the upper frequency limit of hearing is determined by the diameter of the eardrum. The wavelength of the sound wave and the diameter of the eardrum are approximately equal at this upper limit. If the relationship holds exactly, what is the diameter of the eardrum of a person capable of hearing 20 000 Hz? (Assume a body temperature of 37.0C.)
Based on the graph in Figure 17.36, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000 Hz, and many older TVs produce a 15,750 Hz whine. Figure 17.36 The relationship of loudness in phons to intensity level (in decibels) and intensity (in watts per meter squared) for persons with normal hearing. The curved lines are equal-loudness curves—all sounds on a given curve are perceived as equally loud. Phons and decibels are defined to be the same at 1000 Hz.
A pipe is observed to have a fundamental frequency of 345 Hz. Assume the pipe is filled with air (v = 343 m/s). What is the length of the pipe if the pipe is a. closed at one end and b. open at both ends?
Sound level B in decibels is defined as () B = 10 log 1 x 10-12 w/m². The decibel where Io scale intensity for busy traffic is 83 dB. Two people having a loud conversation have a deci- bel intensity of 70 dB. What is the approximate combined sound intensity? Answer in units of W/m2.
given that the density of air 1.20 kg/m^3 and the speed of sound 343 m/s * A vacuum cleaner produces sound with a measured sound level of 70.0 dB. (a) What is the intensity of this sound in W/m? (b) What is the pressure amplitude of the sound?
A point source emits 58.7 W of sound isotropically. A small microphone intercepts the sound in an area of 0.209 cm2, 420 m from the source. Calculate (a) the sound intensity there and (b) the power intercepted by the microphone.
A certain factory whistle can be heard up to a distance of 1.1 km. Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory (in km) is the intensity level of the whistle sound equal to 12 db? The threshold of human hearing is 1.0 * 10^-12 W/m^2.
A typical adult ear has a surface area of 2.1 × 10-³ m². The sound intensity during a normal conversation is about 3.2 x 10-6 W/m² at the listener's ear. Assume that the sound strikes 52. the surface of the ear perpendicularly. How much power is intercepted by the ear?
A 57-dB sound wave strikes an eardrum whose area is 5.0×10−5m^2. The intensity of the reference level required to determine the sound level is 1.0×10−12W/m^2. 1yr=3.156×107s How much energy is absorbed by the eardrum per second? At this rate, how long would it take the eardrum to receive a total energy of 1.0 J?
A point source emits 30.0 W of sound. At 100 m from the source, a small microphone intercepts the sound in an area of 0.5 cm2. Calculate (a) the sound intensity and(b) the intensity level at the location of the microphone(c) What is the power intercepted by the microphone?
Sound is detected when a sound wave causes the tympanic membrane (the ear drum) to vibrate. Typically, the diameter of this membrane is about 8.4 mm in humans. A) how much energy is delivered to the eardrum each second when someone whispers (20 dB) into your ear? B) to comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.

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