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?
The howler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 8.9 km. Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 W/m2. A juvenile howler monkey has an acoustic output of 63 µW. What is the ratio of the acoustic intensity produced by the juvenile howler to the reference intensity I0, at a distance of 210 m? Group of answer choices 300 170 76 110 230
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.0 dB. The hearing aid picks up sound having a frequency of 100 Hz and an intensity of 3.9e-10 W/m22. What is the intensity delivered to the eardrum?
Use the following information for determining sound intensity. The number of decibels β of a sound with an intensity of I watts per square meter is given by β = 10 log(I/I0), where I0 is an intensity of 10−12 watt per square meter, corresponding roughly to the faintest sound that can be heard by the human ear.Due to the installation of a muffler, the noise level of an engine was reduced from 87 to 69 decibels. Find the percent decrease in the intensity level of the noise as a result of the installation of the muffler. (Round your answer to the nearest whole number.)
A typical adult ear has a surface area of 2.1×10-3m2. The sound intensity during a normal conversation is about 3.2×10-6 W/m2 at the listener's ear. Assume that the sound strikes the surface of the ear perpendicular. How much power is intercepted by the ear?
A point source emits 33.1 W of sound isotropically. A small microphone intercepts the sound in an area of 0.173 cm2, 200 m from the source. Calculate (a) the sound intensity there and (b) the power intercepted by the microphone. (a) Number 6.585E-5 Units W/m^2 (b) Number Units W
Chapter 16, Problem 069 Your answer is partially correct. Try again. ES. lem The bellow of a territorial bull hippopotamus is measured at 116 dB above the threshold of hearing. What is the sound intensity? Hint: The threshold of human hearing is Io = 1.00 x 10-12 W/m2. plem %3D blem Number Units W/m^2 ▼ oblem the tolerance is +/-5% oblem roblem SHOW HINT Problem LINK TO TEXT Problem Problem By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Problem Question Attempts: 1 of 6 used SUBMIT ANSWER SAVE FOR LATER Problem Earn Maximum Points available only if you 8:02 PM 4/29/2020 19 e here to search 21 ASL pause break prt sc sysrq f11 f12 insert f8 f9 f10 f4 f5 f6 f7 f2 f3 backspace & %24 80 4 96

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