what is a vibration? how does it help in spreading out the sound?
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Vibration means quickly moving back and forth (or up and down) about a point of equilibrium. The vibration may be periodic (having a pattern) or random. Something that is vibrating may shake at the same time. This vibration will send sound waves to the ear and to the brain.
That's because vibrations pass more easily from one molecule to the next when they are close together. Some solid objects absorb and stop sounds while some conduct and carry sound.
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