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abstraction > mathematical concept > number > quantity > frequency

frequency (ν)
subject			fact

frequency	has symbol ν
	has unit frequency unit
	has definition The number of peaks (often called crests) of a propagating wave that cross a given point in a unit of time. For example, if 1000 peaks cross a given point in one second, one says that the frequency is 1000 cycles per second or 1000 hertz.
	has definition The number of complete wave cycles a wave completes each second.
	has definition The number of oscillations or wave cycles per second passing a given point. For electromagnetic radiation, the product of the frequency and the wavelength is the speed of light.
	has definition The number of cycles or complete alternations per unit time of a carrier wave, band, or oscillation.
	has definition Number of oscillations per second of an electromagnetic wave. The amplitude of a wave depends on the intensity; the wavelength, on the frequency.
	is a kind of quantity
number	has value

Kinds of frequency :

• fundamental frequency (2 facts) - The lowest characteristic frequency of oscillation of a dynamical system.
• gyrofrequency (2 facts) - The frequency with which an electron or other charged particle executes spiral gyrations in moving across a magnetic field.
• harmonic overtone (2 facts) - Any integral multiple of the fundamental frequency
• Intermediate Frequency (3 facts) (IF) - The beat frequency between the signal and the local oscillator in a radio detection system.
• Larmor frequency (2 facts) - The frequency of precession of a charged particle orbiting in a uniform magnetic field. It is equal to eH / 4πm_e, where e is the electron charge, m_e is the electron mass, and H is the magnetic field strength.