vibration - the complete back and forth movement of an object, medium - solids, liquids, gases, pitch - how high or low the sound is, high pitch - high frequency & short wave length, low pitch - low frequency & long wave length, sound - a form of energy that travels as waves through matter, loudness - related to the amplitude of the wave, compression - part of the wave where the particles are close together, rarefaction - part of the wave where the particles are spread apart, mechanical wave - waves that require a medium to transfer energy, longitudinal wave - type of wave that displaces the particles of the medium parallel to the direction in which the wave travels, Transmission - The ability of a wave to pass through matter, Sound absorbing materials - Foam, blankets, Insulation, etc....,

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