The range of sound intensities that the human ear can detect is so large that a special decibel scale (named after Alexander Graham Bell) is used to measure and compare sound intensities. The decibel level (dB) of a sound is given by 4 where Io is the intensity of sound that is barely audible to the human ear. dB(I) = 10 log How many times as great is the intensity of a sound that measures 130 decibels when compared to a sound that measures 120 decibels? timor

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