Second (physics)/Related Articles: Difference between revisions

Revision as of 05:15, 1 December 2010

Time [r]: A fundamental quantity in physics - that what differs always between two inspections of the same system by the same observer. ^[e]

International System of Units [r]: Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela. ^[e]

Speed of light [r]: A physical constant c describing the speed of electromagnetic radiation in vacuum. In the International System of Units the metre is the distance light travels in classical vacuum in 1/c seconds, using the defined value c = c₀ ≡ 299 792 458 m/s (exact). ^[e]

Year [r]: A unit of time measurement that corresponds to one revolution of the earth around the sun, approximately 365¼ days. ^[e]
Month [r]: Unit of time originally corresponding approximately to one cycle of the moon's phases, or about 30 days or 4 weeks. ^[e]
Week [r]: Time unit equal to a number of days, now usually seven calendar days, previously weeks of between 4 and 20 days have been used historically in various places. ^[e]
Day [r]: Defined as 86,400 seconds, using the SI definition of second. ^[e]
Hour [r]: Add brief definition or description
Minute [r]: Add brief definition or description

Metric units [r]: Obsolete term for a system of units in which the unit of length is the meter, the unit of mass the kilogram, and the unit of time the second. ^[e]

Hertz [r]: The international (SI) unit of frequency, with units of inverse seconds, commonly called cycles per seocond. ^[e]
Frequency [r]: For a periodic (i.e., repeating) phenomena, the number of repetitions per unit of time, usually one second; measured in Hertz ^[e]
Electromagnetic wave [r]: A change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons. ^[e]

Light second [r]: Distance that light travels in vacuum in one second; 2.99792458 * 10⁸m. ^[e]

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 ==Parent topics==
+{{r|Time}}
+{{r|International System of Units}}
+{{r|Speed of light}}
 ==Subtopics==
+{{r|Millisecond}}
+{{r|Microsecond}}
+{{r|Nanosecond}}
+{{r|Femtosecond}}
+{{r|Picosecond}}
 ==Other related topics==
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+{{r|Month}}
+{{r|Week}}
+{{r|Day}}
+{{r|Hour}}
+{{r|Minute}}
+{{r|Metric units}}
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+{{r|Hertz}}
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+{{r|Hyperfine level}}
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