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Revision as of 13:24, 20 May 2024

	Speed of light is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Misplaced Pages community. Even so, if you can update or improve it, please do so.
	This article appeared on Misplaced Pages's Main Page as Today's featured article on October 29, 2004, and on August 16, 2022.
Article milestones Date Process Result August 17, 2004 Featured article candidate Promoted December 7, 2008 Featured article review Demoted November 21, 2009 Peer review Reviewed January 25, 2010 Featured article candidate Not promoted October 12, 2010 Peer review Reviewed December 20, 2010 Featured article candidate Promoted March 19, 2022 Featured article review Kept Current status: Featured article

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Physics: Relativity Top‑importance This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Misplaced Pages. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics Top This article has been rated as Top-importance on the project's importance scale. This article is supported by the relativity task force.

There is a request, submitted by ScientistBuilder (talk)ScientistBuilderScientistBuilder (talk) 17:18, 29 January 2022 (UTC), for an audio version of this article to be created. For further information, see WikiProject Spoken Misplaced Pages. The rationale behind the request is: "The speed of light is central to physics fields including the Big Bang Theory, special relativity, general relativity, spectroscopy, optics, as well as real world applications such as signal processing and GPS networks".

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michelson morley experiments?

I think the Michelson-Morley experiments should be added in this wiki. Please adivse. 82.174.79.67 (talk) 21:40, 1 July 2023 (UTC)

See Speed_of_light#"Luminiferous_aether" Headbomb {t · c · p · b} 22:04, 1 July 2023 (UTC)

kilometres per hour to be consistent

The speed of light is approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour. The metric measurement should include 1.08 billion kilometres per hour, to be consistent with metric and imperial examples. Eiger3970 (talk) 07:36, 5 September 2023 (UTC)

Is this part accurate in History?

Quote:

Connections with electromagnetism

In the 19th century Hippolyte Fizeau developed a method to determine the speed of light based on time-of-flight measurements on Earth and reported a value of 315000 km/s (704,634,932 m/h).

His method was improved upon by Léon Foucault who obtained a value of 298000 km/s (666,607,015 m/h) in 1862. Kailandosk (talk) 01:06, 18 November 2023 (UTC)

Are you suggesting our article may not be correct or proposing that it include conversions to km/h at that point, and in either case, why? NebY (talk) 11:07, 18 November 2023 (UTC)

There's a definite discrepancy in number of significant digits between the quoted metric and traditional measurements... AnonMoos (talk) 13:10, 18 November 2023 (UTC)

Indeed, but the values in parentheses aren't in the article. If we wanted to include them, we could use {{Convert}}, which would probably round them appropriately automatically, and wouldn't abbreviate miles to "m" either, but I don't see why we'd want to include such conversions in that part of the article anyway. NebY (talk) 13:46, 18 November 2023 (UTC)

I added the parenthesis. It's just a conversion to m/h that I made, just to show how different they are & to convert it into U.S. terms. Kailandosk (talk) 00:15, 24 December 2023 (UTC)

I'm not sure if 315000 or 298000 km/s is correct. I feel it's 315000 km/s, but I'm not sure. Kailandosk (talk) 18:04, 25 November 2023 (UTC)

Why not also include an accurate description of c in miles per second?

186282.3970512 mi/s, to be fairly accurate.

Speed of light in vacuum

Misplaced Pages should get rid of all occurrences of the phrase "speed of light in vacuum". There is only one speed of light, which is a universal constant. Also the speed of light doesn't change if not in vacuum. Group velocity represents the real speed of a photon, and that doesn't change. Only phase velocity is changing, causing the optical effects that mislead people. Lustakutya (talk) 13:24, 20 May 2024 (UTC)

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