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| <center>For lessons on the related [[topic]] of '''''[[Attunement]]''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Attunement '''''this link'''''].</center> | | <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 [https://en.wikipedia.org/wiki/Rotation rotation], [https://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). |
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− | In [http://en.wikipedia.org/wiki/SI_derived_unit 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. | + | In [https://en.wikipedia.org/wiki/SI_derived_unit 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. |
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| A [[traditional]] unit of [[measure]] used with rotating [[mechanical]] devices is the revolutions per minute, abbreviated rpm. 60 rpm equals one hertz.[1] | | A [[traditional]] unit of [[measure]] used with rotating [[mechanical]] devices is the revolutions per minute, abbreviated rpm. 60 rpm equals one hertz.[1] |
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− | The SI unit for period is the second.[http://en.wikipedia.org/wiki/Frequency] | + | The SI unit for period is the second.[https://en.wikipedia.org/wiki/Frequency] |
| ==See also== | | ==See also== |
| *'''''[[Amplitude]]''''' | | *'''''[[Amplitude]]''''' |
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| ==References== | | ==References== |
| * Giancoli, D.C. (1988), Physics for Scientists and Engineers (2nd ed.), Prentice Hall, ISBN 013669201X | | * 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. | + | *Davies, A. (1997). Handbook of Condition Monitoring: Techniques and Methodology. New York: Springer. pp. 275. ISBN 9780412613203. https://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. | + | *Bakshi, K.A.; A.V. Bakshi, U.A. Bakshi (2008). Electronic Measurement Systems. US: Technical Publications. pp. 4-14. ISBN 9788184312065. https://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. | + | *Elert, Glenn; Timothy Condon (2003). "Frequency Range of Dog Hearing" (in English). The Physics Factbook. https://hypertextbook.com/facts/2003/TimCondon.shtml. Retrieved 2008-10-22. |
| ==External links== | | ==External links== |
− | * [http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#femtosecond National Research Council of Canada: ''Femtosecond comb; The measurement of optical frequencies''] | + | * [https://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#femtosecond National Research Council of Canada: ''Femtosecond comb; The measurement of optical frequencies''] |
− | * [http://www.sengpielaudio.com/calculator-wavelength.htm Conversion: frequency to wavelength and back] | + | * [https://www.sengpielaudio.com/calculator-wavelength.htm Conversion: frequency to wavelength and back] |
− | * [http://www.sengpielaudio.com/calculator-period.htm Conversion: period, cycle duration, periodic time to frequency] | + | * [https://www.sengpielaudio.com/calculator-period.htm Conversion: period, cycle duration, periodic time to frequency] |
− | * [http://www.sengpielaudio.com/calculator-notenames.htm Keyboard frequencies = naming of notes - The English and American system versus the German system] | + | * [https://www.sengpielaudio.com/calculator-notenames.htm Keyboard frequencies = naming of notes - The English and American system versus the German system] |
− | * [http://www.acoustics.salford.ac.uk/schools/index1.htm Teaching resource for 14-16yrs on sound including frequency] | + | * [https://www.acoustics.salford.ac.uk/schools/index1.htm Teaching resource for 14-16yrs on sound including frequency] |
− | * [http://www.ikalogic.com/freq_meter.php A simple tutorial on how to build a frequency meter] | + | * [https://www.ikalogic.com/freq_meter.php A simple tutorial on how to build a frequency meter] |
− | * [http://www.diracdelta.co.uk/science/source/f/r/frequency/source.html Frequency - diracdelta.co.uk] - [[javascript]] calculation. | + | * [https://www.diracdelta.co.uk/science/source/f/r/frequency/source.html Frequency - diracdelta.co.uk] - [[javascript]] calculation. |
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| [[Category: Physics]] | | [[Category: Physics]] |