1. The low-frequency speaker of a stereo set has a surface area of 0.07 m² and produces 1 W ofacoustical power.(a) What is the intensity at the speaker?(b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is theWintensity 0.25?Hint: If the sound projects uniformly in all directions, after traveling a distance r it is uniformlydistributed over a sphere of area r. What is the surface area of a sphere of radius r?W(a) Intensity:(b) Distance (radius), r:m

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1. The low-frequency speaker of a stereo set has a surface area of 0.07 m² and produces 1 W of acoustical power. (a) What is the intensity at the speaker? (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.25 W -? Hint: If the sound projects uniformly in all directions, after traveling a distance r it is uniformly distributed over a sphere of area r. What is the surface area of a sphere of radius r? W (a) Intensity: (b) Distance (radius), r: m ✔m

1. The low-frequency speaker of a stereo set has a surface area of 0.07 m² and produces 1 W of acoustical power. (a) What is the intensity at the speaker? (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.25 W -? Hint: If the sound projects uniformly in all directions, after traveling a distance r it is uniformly distributed over a sphere of area r. What is the surface area of a sphere of radius r? W (a) Intensity: (b) Distance (radius), r: m ✔m

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

Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.

Question

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1. The low-frequency speaker of a stereo set has a surface area of 0.07 m² and produces 1 W of
acoustical power.
(a) What is the intensity at the speaker?
(b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the
W
intensity 0.25?
Hint: If the sound projects uniformly in all directions, after traveling a distance r it is uniformly
distributed over a sphere of area r. What is the surface area of a sphere of radius r?
W
(a) Intensity:
(b) Distance (radius), r:
m

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