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Abbreviated Hz, and named for Heinrich Hertz, a 19th-century German physicist who first investigate radio waves. Hertz is technically defined as the inverse of the time required for one complete cycle of a wave. Thus, a 10 Hz sine wave takes 1/10 of a second to complete a full cycle. In practice, it is the frequency or number of wave cycles occurring per second. In the audio range this equates to what we perceive as pitch.

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