Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency to emphasize the contrast to spatial frequency, and ordinary frequency to emphasize the contrast to angular frequency. Frequency is measured in hertz which is equal to one event per second. 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, T—the time interval between beats—is half a second. 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, radio waves, and light.
| Common symbols | f, ν |
| SI unit | hertz (Hz) |
| Other units | Baud (Bd), cycles per second (cps), revolutions per minute (rpm or r/min), solar neutrino unit (SNU) |
| In SI base units | s −1 |
| SI dimension | wikidata |
| Derivations from, other quantities | f |
Giới thiệu về Frequency
An NYPD detective realizes she can speak to her dead father through a radio. The show is loosely based on the 2000 film of the same name.
Thành tựu & Danh hiệu của Frequency
The show ran for only one season and aired a total of 13 episodes. Rob Mayes and Kenneth Mitchell both guest starred on the show.
