Speed of light/Definition: Difference between revisions

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A definition or brief description of Speed of light.

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).

Revision as of 01:13, 9 March 2011 (view source) imported>John R. Brews (Rewrite definition) ← Older edit		Latest revision as of 17:57, 27 March 2011 (view source) imported>John R. Brews (Rewrite definition)
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	~~The~~ speed of electromagnetic radiation~~, with a defined value~~ in the [[International System of Units]] ~~for propagation in~~ the ~~ideal reference medium of~~ [[~~Free space~~\|classical vacuum]] of c ≡ ~~299 792 458~~ m/s (exact).		A [[physical constant]] ''c'' describing the speed of electromagnetic radiation in vacuum. In the [[International System of Units]] the [[metre (unit)\|metre]] is the distance light travels in [[classical vacuum]] in 1/''c'' seconds, using the defined value {{nowrap\|''c <nowiki>=</nowiki> c<sub>0</sub>''}} ≡ {{nowrap\|299 792 458 m/s}} (exact).