Producing+Sound+Waves

=__**Producing Sound Waves**__=

Sound waves are produced by alternating compression and decompression of a medium. These alterations are called **vibrations**.

media type="file" key="Producing Sound Waves.mp3" width="300" height="50" In this demonstration, you can hear the sound from two tuning forks; one of 256 Hz and one of 1000 Hz. When the forks were struck they vibrated back and forth. The vibrations of the forks caused the air molecules around the forks to vibrate too creating the audible sounds.

The below video shows how sound moves through the air. The marbles represent air molecules. Somewhere, vibrations occur causing the molecules of air to compress and expand and bump into one another like a wave. The wave travels through each molecule until it reaches the human ear and the sound is heard.

media type="file" key="Marbles.mov" width="300" height="300"

__ References __ http://www.spartechsoftware.com/reeko/Experiments/ExpSoundWaves.htm