Frequency

related topics
{math, energy, light}
{rate, high, increase}
{system, computer, user}
{album, band, music}
{math, number, function}
{language, word, form}
{day, year, event}

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. Loosely speaking, 1 year is the period of the Earth's orbit around the Sun,[1] and the Earth's rotation on its axis has a frequency of 1 rotation per day.[2]

Contents

Definitions and units

For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles per unit time. In physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a Latin letter f or by a Greek letter ν (nu).

In SI units, the unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz: 1 Hz means that an event repeats once per second. A previous name for this unit was cycles per second.

Full article ▸

related documents
Magneto-optic effect
Electron volt
Zodiacal light
Ring Nebula
Fermat's principle
Horizontal coordinate system
Algol
Astronomical distance
Datum (geodesy)
Astronomical unit
Nusselt number
SI base unit
Nutation
Near-Earth object
Spectrum
Mira
Counter-Earth
Electron hole
Electromagnetic force
Spin glass
Relative static permittivity
Observatory
Positronium
Super-Kamiokande
Amalthea (moon)
Inclination
Proper motion
International Atomic Time
Aldebaran
Double pendulum