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) is given by dB(I) = 10 log- log (1) where Io is the intensity of sound that is barely audible to the human ear. Use the decibel level formula to find the decibel level for the following sounds. Round to the nearest tenth of a decibel. (a) Automobile traffic, I= 1.58 x 108. Io dB (b) Quiet conversation, I= 10,800 Io dB (c) Fender guitar, I= 3.16 x 1011. Io dB (d) Jet engine, dB I= 1.58 x 1015. Io 1 Deminder

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