HW 11 - fielder (rgf357) HMW11 clavelli (31415) 1 This...

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Unformatted text preview: fielder (rgf357) HMW11 clavelli (31415) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A point source emits sound waves with an average power output of 2 . 2 W. Find the intensity 2 . 81 m from the source. Answer in units of W / m 2 . 002 (part 2 of 2) 10.0 points Find the distance at which the sound reduces to a level of 61 dB. Answer in units of m. 003 10.0 points The threshold of hearing in air corresponds to a frequency of 1000 Hz and an intensity of about 8 . 2 10 13 W / m 2 . When someone under water hears such sound, what is the corresponding maximum displacement? The density of water is 1000 kg / m 3 and the speed of sound in wa- ter is 1493 m / s. Answer in units of m. 004 (part 1 of 2) 10.0 points An ambulance is traveling east at 48 . 9 m / s....
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This note was uploaded on 04/14/2010 for the course PH 105 taught by Professor Stanjones during the Spring '08 term at Alabama.

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