Frequency

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s of various frequencies; the bottom waves have higher frequencies than those above.Frequency is the measurement of the number of occurrences of a repeated event per unit of time. It is also defined as the rate of change of phase (waves) of a sinusoidal waveform.

Measurement To calculate the frequency of the event, the number of occurrences of the event within a fixed time interval are counted, and then divided by the length of the time interval.

To calculate the frequency of an event in experimental work however (for example, calculating the frequency of an oscillating pendulum) it is crucial that the time taken for a fixed number of occurrences is recorded, rather than the number of occurrences within a fixed time. This is because your random error is significantly increased performing the experiment the other way around. It frequency is still calculated by dividing the number of occurrences by the time interval, however, the number of occurrences is fixed, not the time interval.

In SI units, the result is measured in Hertz, named after the German physicist Heinrich Hertz. 1 Hz means that an event repeats once per second, 2 Hz is twice per second, and so on. This unit was originally called a cycle per second (cps), which is still sometimes used. Other units that are used to measure frequency include revolutions per minute (rpm). Heart rate and musical tempo are measured in beats per minute (BPM).Often, angular frequency is used instead of frequency, measured in radians per second (rad/s).

An alternative method to calculate frequency is to measure the time between two consecutive occurrences of the event (the period) and then compute the frequency f as the reciprocal of this time: f = \frac{1}{T}where T= time or period is the period (physics).

A more accurate measurement takes many cycles into account and averages the period between each.

==Frequency of waves==Frequency has an inverse relationship to the concept of wavelength. The frequency f is equal to the speed v of the wave division (mathematics) by the wavelength λ (lambda) of the wave: f = \frac{v}{\lambda}

In the special case of electromagnetic waves moving through a vacuum, then v = c, where c is the speed of light in a vacuum, and this expression becomes: f = \frac{c}{\lambda}

When waves travel from one Medium (optics) to another, their frequency remains exactly the same — only their wavelength and speed change.

Apart from being modified by the Doppler effect or any other nonlinear process, frequency is an invariant quantity in the universe. That is, it cannot be changed by any linearly physical process unlike velocity of propagation or wavelength.

Examples

See also

External links



BBC World Service - Radio Schedules & Frequencies
Global Short Wave Frequencies : For short wave frequencies, please select your region from the links below.

Frequency Design Studio / Design for Print and Digital Media ...
Frequency is a graphic design partnership based in Cork, Ireland specialising in print and web design including brochures, corporate identity, annual reports, websites, flash sites ...

Frequency - Wikipedia, the free encyclopedia
Frequency is a measure of 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 ...

GCSE Physics: Frequency & hertz (Hz)
Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers.

GCSE Physics: Frequency
Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers.

Frequency Alive - Welcome to Frequency Magazine Online
The online home of Swindon's cultural magazine... Frequency. ... Welcome to Frequency the arts magazine for the Swindon and local area. The new issue has been released and is out ...

Frequency Modulation from FOLDOC
Frequency Modulation < communications > (FM) A method of encoding data by varying the frequency of a constant amplitude carrier signal. Contrast Amplitude Modulation.

Frequency Shift Keying from FOLDOC
Frequency Shift Keying < communications > (FSK) The use of frequency modulation to transmit digital data, i.e. two different carrier frequencies are used to represent zero and one.

Definition: frequency from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.

Companion Website for: Word Frequencies in Written and Spoken English
Companion Website for: Word Frequencies in Written and Spoken English ... Word Frequencies in Written and Spoken English: based on the British National Corpus.





 
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