Turn Up The Sound By PresenterMedia.comPresenterMedia.com

Our Goals for this Lesson To understand what causes the volume of a sound To know how amplitude effects sound To see how sound absorption plays a role in eliminating sound pollution. Goal #1 Goal #2 Goal #3 Goal #4 To learn how to decrease noise pollution

Volume- describes how loud or soft a sound is. Intensity- a measure of the amount of energy in a sound wave Decibel- the special unit used to measure sound intensity or volume. Noise Pollution- the occurrence of loud or unpleasant sound in the environment VOCABULARY

When you are changing the volume or loudness of your T.V., you are also changing the intensity of the sound or measure of the amount of energy in the sound wave. Recall that amplitude is the characteristic of sound that effects its loudness and softness. The higher the amplitude the louder the sound. Turn Up the Sound

Each time a sound jumps up 10 dB it increases by a factor of 10. Of course what causes a sound to be disrupting to you depends on other factors. Example: Rustling Newspaper at 30 dB might be more disruptive if you are studying than a sudden burst of thunder at 110 dB. A sound of 120 dB is loud enough to cause pain in your ears. Measuring Sound Volume

When measuring volume, we use a unit called decibel or dB. Below is a list of sources of sound. The higher the intensity or decibel (dB) the louder the sound. Measuring Sound Volume

Noise pollution is the occurrence of loud or unpleasant sound in the environment. An understanding of the properties of sound can help you reduce noise pollution. Like light, sound is absorbed my some materials and reflects off of others. Materials that are hard such as concrete or brick reflects most of the sound that reaches them. Noise Pollution

You saw in our experiment that some materials were better absorbers of sound that others. Materials that are soft, such as cloth, plastic foam, and plaster, absorbs much of the sound that reaches them. In many buildings, such sound absorbers are built right in. Noise Pollution

Question: Mr. Mostov wants to reduce the noise of loud students in his classroom. What kind of floor or wall coverings should he use to help absorb some of the sound? Exit Slip Question Write this on scrap piece of paper you collected at the begging of class.