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17. Two observation points are located at distances ri and r, from a source of sound. The sound spreads out uniformly from the source, and there are no reflecting surfaces in the environment. The sound intensity level at distance r, is 6 dB less than the level at distance η. (a) What is the ratio Ifll, of the sound intensities at the two distances? (b) What is the ratio r/ri of the distances?
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