# A sound wave traveling in 20ºC air has a pressure amplitude of 0.5 Pa. What is the intensity of the wave?

##### 1 Answer

Intensity is defined as power over an area. It's given by

where

The intensity of a sound wave is given by the following eq'n:

where

Given this equation, along with constants, you can substitute your values and solve.

The constant for the speed of sound in air at 20*C is 343

The density of air is 1.2041

I use my Physics for Scientists and Engineers (9th ed.) and my professor's notes to find equations and constants for most problems, including this one. Good luck!