This pressure increases as the loudness of the sound increases. If the loudness D is measured in decibels and the pressure P in dynes7 per square centimeter, then the relationship is given by a....

This pressure increases as the loudness of the sound increases. If the loudness D is measured in decibels and the pressure P in dynes7 per square centimeter, then the relationship is given by

a. Ordinary conversation has a loudness of about 65 decibels. What is the pressure exerted on the human ear by ordinary conversation?

b. A decibel level of 120 causes pain to the ear and can result in damage. What is the corresponding pressure level on the ear?