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Sound Level: a Certain Source of Sound Waves Radiates Uniformly

Question 83

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Sound level: A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db. What is the total acoustic power output of the source, in watts? (Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)

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