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            <Attribute name="description">Sound is a compression wave. Sound waves require a matter medium (solid, liquid, or gas) to travel through, and cannot travel through vacuum. The amplitude of a sound wave corresponds to its loudness. The frequency of a sound wave corresponds to its pitch. The speed of a sound wave depends on the medium its traveling through. Sound waves exhibit wave behaviors like reflection, which are useful in a variety of applications. Waves intro and Sound waves by PhET Interactive Simulations, University of Colorado Boulder, CC BY 4.0. https://phet.colorado.edu/en/simulations</Attribute>
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