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Frequency

The number of times a signal vibrates each second as expressed in cycles per second (cps) or Hertz (Hz).
Frequency

Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.

Key Terms

angular frequency
contrast
duration time
frequency
number occurrences
period
repeating event per unit
spatial frequency
temporal frequency
time

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Frequency
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Last modified on June 22 2019
Content adapted from Wikipedia
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