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QUESTION The power output of a sound system is increased by a factor of 25. By what factor should you adjust your distance from the speakers so the sound intensity is the same? PRACTICE IT Use the worked example above to help you solve this problem. A small source emits sound waves with a power output of 82.9 w. (a) Find the intensity 3.05 m from the source. W/m2 (b) At what distance would the intensity be one-fourth as much as it is at 3.0s m (c) Find the distance at which the sound level is 36.7 dB EXERCISE HINTS: GETTING STARTED I 1.M STUCK! Suppose a certain jet plane creates an intensity level of 129 dB at a distance of 5.71 m. What intensity level does it create on the ground directly underneath it when flying at an altitude of 2.24 km?

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Answer #1

I = P/4πr^2

ㄧˊ str) 4TrY o-707 118 S als 82.9 2 1冫4.67735 e 10-9 4.67725 。-1-82.9

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