The decibel level [i]d[/i] of a sound is based on the ratio of the intensity [i]I[/i] of that sound to the lowest threshold that can be heard by a human (intensity of 1) and can be modeled by the equation[br][math]d=10log\left(I\right)[/math]. View the following [color=#3c78d8][url=http://home.earthlink.net/~dnitzer/4HaasEaton/Decibel.html]Sound Intensity Table[/url].[/color]

Listen to the Introduction tab of [url=https://science.education.nih.gov/supplements/nih3/hearing/activities/lesson3.html]Do You Hear What I Hear?[/url][br][br]Explore and use the Hearing Response tab to answer the questions.[br][br]Listen to the three speeches on the Filtered Sound tab and answer the questions.[br][br]

Explore this [url=http://www.iknowthat.com/mhscience/Earthquakes/earthquake_movie.html]Earthquake Simulator[/url] and investigate the damage based on different Magnitude levels of earthquakes.