Part DThe threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10-12 W/m². Find the distance d from the car at which the sound fromthe stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 W of sound, as suggested in the last follow-up comment.Express your answer numerically in meters.VE ΑΣΦd =SubmitProvide FeedbackRequest Answer?mNext > Item 7Learning Goal:To understand the concept of intensity; the relationship between the powerof the source and the intensity of the wave; and the dependence of intensityon distance.Since waves transfer energy from one point to another, one can define thepower of a wave as the rate at which the wave transports energy. Theintensity of a wave, in contrast, is the power relative to a certain surface.Consider a wave traveling across a surface perpendicular to the direction ofpropagation. The intensity I of the wave is defined as the ratio of the powerP of the wave to the area A of that surface:1 = ²/ PNote that the surface may be real (physical, like an eardrum or awindowpane) or mathematical. Quite frequently, we will be interested in theintensity produced by a relatively small source at a relatively large distance.If the source emits waves uniformly in all possible directions (producesspherical waves), the formula given here makes it possible to find theintensity at a distance r from the source:I =P4π7²Note that, in all parts of this problem, assume that the source generatesspherical waves, so that this intensity formula is applicable.Intensity is measured in watts per square meter (W/m²). All theinformation presented here is pertinent to any kind of wave. In this problem,we will be focusing on sound waves.A popular car stereo has four speakers, each rated at 60 W. In answering the following questions, assume that the speakers produce sound at their maximum power.Part AFind the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.0 m.Express your answer numerically in watts per square meter. Use two significant figures.I = 4.8 W/m²Submit✓ CorrectPart BFind the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.5 m.Express your answer numerically in watts per square meter. Use two significant figures.I = 2.1 W/m²SubmitPrevious AnswersPart CPrevious AnswersSubmitCorrectNote that the intensity I is inversely proportional to the square of the distance from the source. For example, if you quadruple your distance from the source, at the newlocation the wave will have one-sixteenth the intensity (assuming that no energy is absorbed between the two locations). Thus, the greater the distance, the smaller thewave intensity.7 of 15ReviewFind the intensity I of the sound waves produced by four 60-W speakers as heard by the driver. Assume that the driver is located 1.0 m from each of the two front speakers and1.5 m from each of the two rear speakers.Express your answer numerically in watts per meter squared.I = 13.8 W/m²Previous Answers>

Answered: Image /qna-images/answer/a229335c-d49a-4afe-ae5d-97de032ef95a.jpg

▾ Part D The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10-12 W/m². Find the distance d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 W of sound, as suggested in the last follow-up comment. Express your answer numerically in meters. d= Submit rovide Feedback ΑΣΦ Request Answer ? m Next >

▾ Part D The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10-12 W/m². Find the distance d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 W of sound, as suggested in the last follow-up comment. Express your answer numerically in meters. d= Submit rovide Feedback ΑΣΦ Request Answer ? m Next >

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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Concept explainers

Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.

Question

Part D
The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10-12 W/m². Find the distance d from the car at which the sound from
the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 W of sound, as suggested in the last follow-up comment.
Express your answer numerically in meters.
VE ΑΣΦ
d =
Submit
Provide Feedback
Request Answer
?
m
Next >

Item 7
Learning Goal:
To understand the concept of intensity; the relationship between the power
of the source and the intensity of the wave; and the dependence of intensity
on distance.
Since waves transfer energy from one point to another, one can define the
power of a wave as the rate at which the wave transports energy. The
intensity of a wave, in contrast, is the power relative to a certain surface.
Consider a wave traveling across a surface perpendicular to the direction of
propagation. The intensity I of the wave is defined as the ratio of the power
P of the wave to the area A of that surface:
1 = ²/ P
Note that the surface may be real (physical, like an eardrum or a
windowpane) or mathematical. Quite frequently, we will be interested in the
intensity produced by a relatively small source at a relatively large distance.
If the source emits waves uniformly in all possible directions (produces
spherical waves), the formula given here makes it possible to find the
intensity at a distance r from the source:
I =
P
4π7²
Note that, in all parts of this problem, assume that the source generates
spherical waves, so that this intensity formula is applicable.
Intensity is measured in watts per square meter (W/m²). All the
information presented here is pertinent to any kind of wave. In this problem,
we will be focusing on sound waves.
A popular car stereo has four speakers, each rated at 60 W. In answering the following questions, assume that the speakers produce sound at their maximum power.
Part A
Find the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.0 m.
Express your answer numerically in watts per square meter. Use two significant figures.
I = 4.8 W/m²
Submit
✓ Correct
Part B
Find the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.5 m.
Express your answer numerically in watts per square meter. Use two significant figures.
I = 2.1 W/m²
Submit
Previous Answers
Part C
Previous Answers
Submit
Correct
Note that the intensity I is inversely proportional to the square of the distance from the source. For example, if you quadruple your distance from the source, at the new
location the wave will have one-sixteenth the intensity (assuming that no energy is absorbed between the two locations). Thus, the greater the distance, the smaller the
wave intensity.
7 of 15
Review
Find the intensity I of the sound waves produced by four 60-W speakers as heard by the driver. Assume that the driver is located 1.0 m from each of the two front speakers and
1.5 m from each of the two rear speakers.
Express your answer numerically in watts per meter squared.
I = 13.8 W/m²
Previous Answers
>

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