Difference between revisions of "Frequency"
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'''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. | '''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. | ||
− | <center>For lessons on the related [[topic]] of '''''[[Attunement]]''''', follow [ | + | <center>For lessons on the related [[topic]] of '''''[[Attunement]]''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Attunement '''''this link'''''].</center> |
==Definitions and units== | ==Definitions and units== | ||
For cyclical [[processes]], such as [http://en.wikipedia.org/wiki/Rotation rotation], [http://en.wikipedia.org/wiki/Oscillation oscillations], or [[waves]], frequency is defined as a [[number]] of [[cycles]], or periods, 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). | For cyclical [[processes]], such as [http://en.wikipedia.org/wiki/Rotation rotation], [http://en.wikipedia.org/wiki/Oscillation oscillations], or [[waves]], frequency is defined as a [[number]] of [[cycles]], or periods, 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). |
Revision as of 22:26, 12 December 2020
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.
Definitions and units
For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles, or periods, 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 hertz (Hz), named after the German physicist Heinrich Hertz. For example, 1 Hz means that an event repeats once per second.
A traditional unit of measure used with rotating mechanical devices is the revolutions per minute, abbreviated rpm. 60 rpm equals one hertz.[1]
The period is usually denoted as T, and is the reciprocal of the frequency f:
The SI unit for period is the second.[1]
See also
References
- Giancoli, D.C. (1988), Physics for Scientists and Engineers (2nd ed.), Prentice Hall, ISBN 013669201X
- Davies, A. (1997). Handbook of Condition Monitoring: Techniques and Methodology. New York: Springer. pp. 275. ISBN 9780412613203. http://books.google.com/books?id=j2mN2aIs2YIC&pg=RA1-PA275.
- Bakshi, K.A.; A.V. Bakshi, U.A. Bakshi (2008). Electronic Measurement Systems. US: Technical Publications. pp. 4-14. ISBN 9788184312065. http://books.google.com/books?id=jvnI3Dar3b4C&pg=PT183.
- Elert, Glenn; Timothy Condon (2003). "Frequency Range of Dog Hearing" (in English). The Physics Factbook. http://hypertextbook.com/facts/2003/TimCondon.shtml. Retrieved 2008-10-22.
External links
- National Research Council of Canada: Femtosecond comb; The measurement of optical frequencies
- Conversion: frequency to wavelength and back
- Conversion: period, cycle duration, periodic time to frequency
- Keyboard frequencies = naming of notes - The English and American system versus the German system
- Teaching resource for 14-16yrs on sound including frequency
- A simple tutorial on how to build a frequency meter
- Frequency - diracdelta.co.uk - javascript calculation.