# 3.2 Summary

The number of cycles of oscillation per second, both for a vibrating source and a pressure wave, is known as the frequency, symbol f Frequency is specified in hertz (Hz) or kilohertz (kHz). One hertz is one cycle per second; one kilohertz is one thousand cycles per second. Frequency and period are directly related. Frequency is the reciprocal of period:

OpenLearn - Sound for music technology: An introduction
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