The loudness level of a sound, D , in decibels, is given by the formula D = 10log(10 12I ), where I is the intensity of the sound, in watts per meter...

The loudness level of a sound, D, in decibels, is given by the formula

 D =

 10log(1012I), where I is the intensity of the sound, in watts per meter2. Decibel levels range from 0, a barely audible sound, to 160, a sound resulting in a ruptured eardrum. (Any exposure to sounds of 130 decibels or higher puts a person at immediate risk for hearing damage.) What is the decibel level of a normal conversation, 3.2 x 10-6 watt per meter2?