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# PhyIIHW2 - hopkins(tlh982 – HW02 – criss –(4908 1...

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Unformatted text preview: hopkins (tlh982) – HW02 – criss – (4908) 1 This print-out should have 16 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 skyrocket explodes 126 m above the ground. Three observers are spaced 107 m apart, with observer A directly under the point of the explosion. A B C 126 m 107 m 107 m Find the ratio of the sound intensity heard by observer A to that heard by observer B. 002 (part 2 of 2) 10.0 points Find the ratio of the intensity heard by ob- server A to that heard by observer C. 003 10.0 points A siren creates a uniform sound level of 94 . 6 dB at 704 m away. The siren is pow- ered by a battery that delivers a total energy of 0 . 621 kJ. Assuming that the efficiency of the siren is 44 . 8 percent ( i.e. , 44 . 8 percent of the supplied energy is transformed into sound energy), determine the total time the siren can sound. Answer in units of s. 004 10.0 points The sound level produced by one singer is 64 . 8 dB. What would be the sound level produced by a chorus of 19 such singers (all singing at the same intensity at approximately the same...
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PhyIIHW2 - hopkins(tlh982 – HW02 – criss –(4908 1...

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