Chapter 5.4, Problem 129AYU

Loudness of sound Problems 129–132 use the following discussion: The loudness $L\left(x\right)$, measured in decibels (dB), of a sound of intensity $x$, measured in watts per square meter, is defined as $L\left(x\right)=10\log \frac{x}{I_0}$, where $I_0={10}^{212}$ watt per square meter is the least intense sound that a human ear can detect. Determine the loudness, in decibels, of each of the following sounds.

Normal conversation: intensity of $x={10}^{-7}$ watt per square meter