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Unformatted text preview: Li (sl7433) HW11 Tsoi (58020) 1 This printout should have 19 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Everyone at a party is talking equally loudly. If only one person were talking, the sound level would be 61 dB. Find the sound level when all 55 people are talking. Answer in units of dB. 002 10.0 points An ocean wave travels 15 . 1 m in 7 s. The distance between two consecutive wave crests is 5 . 1 m. What is the frequency of the wave? Answer in units of Hz. 003 10.0 points A stereo speaker represented by P in the fig ure emits sound waves with a power output of 103.7 W. P x b b 6 . 54 m What is the intensity of the sound waves at point x , 6.54 m away? Answer in units of W / m 2 . 004 10.0 points A clarinet behaves like a tube closed at one end. The velocity of sound is 344 m / s . If its length is 2 . 6 m, what is its fundamen tal frequency? Answer in units of Hz....
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 Spring '09
 Ditmire
 Physics

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