Problems 131134 use the following discussion: The loudness L(x), measured in decibels (dB), of a sound of

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Problems 131–134 use the following discussion: The loudness L(x), measured in decibels (dB), of a sound of intensity x, measured in watts per square meter, is defined as L(x) = 10 log x/I0, where I0 = 10−12 watt per square meter is the least intense sound that a human ear can detect. Determine the loudness, in decibels, of each of the following sounds.

Heavy city traffic: intensity of x = 10−3 watt per square meter.

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