The loudness level of a sound can be expressed by comparing the sound's intensity to the intensity of a sound barely audible to the human ear. The formula D = 10 ( log l- log lo) describes the loudness level of a sound, D, in decibels, where I is the intensity of the sound, in watts per meter, and Io is the intensity of a sound barely audible to the human ear. Use this information answer parts (a) and (b) below. a. Express the formula so that the expression in parentheses is written as a single logarithm. Choose your answer below. OA. D= 10 log ( •) YB. D= 10 log OC. D= 10 log (1-6) OD. D= log b. Use the form of the formula from part (a) to answer this question. If a sound has an intensity 1/1,000,000th of the intensity of a louder sound, how much smaller on the decibel scale is the loudness level of the less intense sound? Ndecibels softer

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