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'''Frequency''' is a measure of how many times a given event happens in a given period of time. It is directly related to [[wave]] mechanics, and is the reciprocal of [[period]]. The [[International_System_of_Units | SI unit]] of frequency is the [[hertz]] (Hz), which corresponds to a single cycle per second, giving it the general unit of ''s''<sup>-1</sup>. Frequency cannot be modified by a physical process, although phenomena such as the [[Doppler Effect]] can change how frequency is perceived by a person in motion towards or away from an audio source.
'''Frequency''' is a measure of how many times a given event happens in a given period of time. It is directly related to [[wave]] mechanics, and is the reciprocal of [[period]]. The [[International System of Units|SI unit]] of frequency is the [[hertz]] (Hz), which corresponds to a single cycle per second, giving it the general unit of ''s''<sup>−1</sup>. Frequency cannot be modified by a physical process, although phenomena such as the [[Doppler Effect]] can change how frequency is perceived by a person in motion towards or away from an audio source.
[[Category:Physics]]
[[Category:Physics]]