Sound Wave Properties: Frequency and Amplitude
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A sound wave's frequency, measured in hertz, is perceived as pitch, and its amplitude, measured in decibels, is perceived as volume; humans typically hear between about 20 and 20,000 hertz.
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Dogs detect frequencies up to about 40,000 hertz, well above the human ceiling.
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Sound waves need a medium to travel through — unlike light, they cannot propagate through a vacuum.