Chapter 12.6, Problem 86PE

The decibel level of sound can be found by the equation $D=10\log \left(\frac{I}{I_0}\right)$, where I is the intensity of the sound and $I_0$ is the intensity of the least audible sound that an average person can hear. Generally $I_0$ is found as ${10}^{-12}$ watt per square meter $\left({\text{W/m}}^{\text{2}}\right)$. Use the information to answer exercises 85-86.

Given that normal conversation has a decibel level of 65 and $I_0={10}^{-12}$, find the intensity of the sound of normal conversation.