### Home > CCA2 > Chapter 11 > Lesson 11.2.1 > Problem 11-49

11-49.

Logarithms are used to measure the “loudness” of sound. Decibels (dB) are logarithmic units used to describe a ratio of two levels of intensity or pressure. The difference between two levels of sound pressure ( and

*) is defined as*

How many decibels correspond to doubling the pressure of a sound?

log What is the sound pressure of a noise described as

dB? log log

What does

decibels mean? The sound ratio is

. How many times more pressure is in a sound of

dB than of dB? times more pressure.