Vibrations and sound Sound Physics

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=zHKDuSTNZE4

This activity shows how sound is always accompanied by vibrations. A plucked guitar string produces a sound. When observed closely, it can be seen that the string is vibrating since it appears to shimmer. If we stop the vibrations, the sound also stops. Next we put some pulses on a drum and hit the drum. We see that the pulses jump as soon as the sound is produced. 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