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Physics / University Physics 13 / Chapter 15 / Problem 27E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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Energy Output. By measurement you determine that sound

Chapter 15, Problem 27E

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QUESTION:

Energy Output. By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 0.026 W/m2 at a distance of 4.3 m from the source. (a) What is the intensity at a distance of 3.1 m from the source? (b) How much sound energy does the source emit in one hour if its power output remains constant?

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QUESTION:

Energy Output. By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 0.026 W/m2 at a distance of 4.3 m from the source. (a) What is the intensity at a distance of 3.1 m from the source? (b) How much sound energy does the source emit in one hour if its power output remains constant?

ANSWER:

Solution 27E Step 1: Power related to intensity at distance r is given by P = I(4r )2 Energy is power times time. 2 Apply (r /1 )2= I /I1 2

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