frequency

- noun the number of repetitions per unit time of a complete waveform such as an electric or sound wave
- noun the
__probability__of a item occurring in a sample - noun the number of occurrences of something in a group or sample
- prefix one thousandth of a million millionth (10
^{-15}).

- The number of waves of
__radiation__of a particular wavelength passing a fixed point per second. The unit of frequency is the Hertz, one per second. The frequency of a signal multiplied by its wavelength equals its velocity, so that electromagnetic radiation of one metre wavelength must have a frequency of 300,000,000 hertz, or 300MHz, since all electromagnetic radiation has a velocity of 300,000 km per second in empty space. The same principle applies to other forms of wave energy like seismic waves and vibrations in interstellar gas clouds.

- For a periodic
__phenomenon__, the__number__of complete cycles per__unit__of time. When the unit of time is one__second__, the unit of frequency is the hertz. That is, 1 complete__cycle__per second is 1 Hz. Various multiples of hertz are frequently encountered in__electronics__, including kilo-hertz,__megahertz__,__gigahertz__, and so on. Examples of periodic__phenomena__include electromagnetic waves,__sound__waves, and__AC__. It is the__reciprocal__of period (2). Its__symbol__is, or*f*, and its abbreviation is freq.*v* - symbol f

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