Knowledge

:Featured article candidates/Speed of light/archive2 - Knowledge

Source πŸ“

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I am nominating this for featured article because all the controversies which there have been in recent months seem to have settled (no major edit in the last month or so), all of the points in the last peer review were addressed (or made moot by trimming superfluous stuff), and I think the article
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Ah, you mean the ones in the references. I've fixed them (except NASA which is more widely known by its acronym than by its full name, and FSTC whose expansion on whose website I cannot found). BTW, I'm fixing your indentation mark-up – you have to copy and paste the indentation of the post you're
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Personally, I don't think a source is strictly needed for such an unsurprising fact (that if the number of metres in one light-second and the number of metres in one mile/yard/foot/inch are both exactly fixed by definition, then so is the number of miles/yards/feet/inches in a light-second), but
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I've added a cite for the values, but I can't find anyone on the Web (except for WP mirrors) mentioning that the 1950 value was adopted by the 1957 12th URSI GA, so I've removed that part. (The source gives errors three times as large as the one we had, but maybe that's because they use
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That page suggests "Self-published material may, in some circumstances, be acceptable when produced by an established expert on the topic of the article whose work in the relevant field has previously been published by reliable third-party publications." That is the case for
756:: Not all images on NASA's website are in public domain (they use a few copyrighted images as well); as such please point this image's source to the NASA page that is displaying it, instead of the link to the image itself (so we can verify if it is NASA authorship). 478:, according to which the publisher is the institution hosting the website. If that's not always right, it should be explained there. Anyway, those FAQ were posted on physics newsgroups for years (so they were reviewed quite a lot, I suppose), and were edited by 1219:
I can find a lot of cites for the 299,792.5Β±1.0 km/s, but none mentions the controversy or the 12th URSI General Assembly. The proceedings of that assembly seem not to be not available on-line, so I asked the editor who added that section in the first place.
524:. Some of them in turn cite a wealth of unquestionably reliable sources. Lastly, the points they support are very uncontroversial and most of them are also supported by other sources, which however aren't freely available on-line (e.g. Sakurai's book). ― 953:, an animated GIF, shows a beam of light travelling between the two bodies. However displayed at a width of 360px, the beam is not rendered; it simply becomes a black bar with two very small circles at either end. Not a good choice image. 1136:
I've tried to use a more neutral wording, but I fear I might have overdone that; after all, we're not writing about a living person or a commercial product, and it'd be ridiculous to accuse us of being biased towards the speed of light.Β :-)
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Is it better now? A minimum of interpretation is unavoidable, but at least it doesn't mention proper names which aren't found in the picture itself. ("Sun" should be unproblematic, as it's the stereotype depiction which even children use.)
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no longer abbreviations: many people who use them don't even know that they originally stood for "principal" and "diffuse", and anyway spelling those out isn't going to help the readers who don't know what they mean in that context.
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has alt text that doesn't really capture the graph (the fairly sharp knee and the asymptote); the existing alt text "curved sharply upward and to the right" would describe the sqrt function better than it describes this function.
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Not to mention that the Usenet physics FAQ has been read by many other physics experts and has passed their peer review. As such I would consider it much more reliable than for example a text book written by a single author.
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I restored "important", but "particularly" and "crucial" are (still) out. Please let us know if you think that "important" is a problem. If anything, "important" is an understatement, but I agree that a gushing tone is not
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at the end, depending on whether you want a bullet, a number or neither at the beginning of your post; otherwise, you can get misplaced bullets and wrong numbers in visual browsers, and even worse things in screen readers.
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The paragraph that begins with the sentence, "The finite speed of light is particularly important in astronomy", seems too opinionated. It would be more encyclopedic if written without the "particularly important" and
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would stay the same. On the other hand, I seem to recall there were pages or sections specifically about the indices of refraction of air, glass and water, and I'll somehow link to them if I find them.
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And I see that the album which inevitably springs to mind when seeing that picture is featured on the Main Page today. (Incidentally, it happens to be one of my favourite albums.) ―
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Unfortunately, this turns out to be a copyviolation (sneaky NASA!!). The image is copyrighted to Exploratorium. Originally, NASA used it as is, with Exploratorium's watermark (see
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I think there was a discussion about that on the talk page, but the archives have such a low signal-to-noise ratio that finding that discussion is going to be an awful task. ―
1175:"Until relatively recent times" is a tad vague. The seventeenth century doesn't seem like recent times. Instead, I'd say something like "Prior to the seventeenth century," 499:
says that internet forum postings are not generally reliable, but there are exceptions. For these to work, we'd need to see why the author/etc. meets those exceptions.
1329:"The main problem with interferometry is to measure the frequency of light in or near the optical region." I think this needs some clarification. Why is it a problem? 782: 876:
Something bothers me about this image. The light sources are shown as light bulbs, but light bulbs emit incoherent light and thus cannot produce interference.
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Please spell out abbreviations in the notes. Yes, they are linked, but you don't want your readers to leave your article, they might never return
397:. If we do need a source, I agree that this one isn't the best possible one, but if it's fine for anyone else around here, it's fine for me. ― 517:
and if we interpret "produced" more broadly than "written" (as in "I produced my ticket to the collector"), the FAQs are on the UCR pages of
30: 17: 905: 425: 898:. As I see it this doesn't prevent him modifying the image on commons, or the ban could be adjusted to let him participate more fully. -- 184: 597:
article. On the other hand, the applet is quite illustrative, so I was going to move it to "External links", but it's already there. ―
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I've removed some. The one to "matter" was particularly unhelpful, as it suggested that there is an accepted technical definition of
571:, use the work field for the title of the paper, and the publisher field for the name of the actual company that publishes the paper 414:
Current ref 15 (Gibbs) the publisher is NOT the University of California Riverside, its Gibbs, so what makes him a reliable source?
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NASA simply cropped off the watermark and displayed it on their StarGazerz site. Exploratorium's materials are copyrighted.
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threads about that. I'll try to make a smaller version of the picture myself; meanwhile I've shown it at full size using
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relevant to this article, whereas in that sentence "other types of matter" could be replaced with "other stuff" and the
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Nope. My "institution participates in JSTOR, but doesn't have access to this article." Not a vital point, though. ―
1237:, according to his own user page, has retired from Knowledge. What Wikiprojects could I ask for such a citation? ― 1279:
when I get back to the university, where (IIRC) I can access to the full text of JSTOR entries, I'll read it.
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Removed. "High group index" is completely equivalent to "low group velocity", so that was redundant. ―
778: 521:, probably the best-known living mathematical physicist; they are cited in twenty Knowledge articles. 277:
I've asked the user who added this for the page number; meanwhile I'm adding a "page needed" tag. ―
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Sources that are in languages other than English need to have that language noted in the reference
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Yes, I wish we all had easier access to JSTOR. There's a lot of useful material in that archive.β€”
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Why does the "Laboratory demonstration" section matter? Is there a benefit to that capability?
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there was a discussion about that in November. The source cited here was found by Joe Kress in
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Right, that's self-published by a SF writer, and that sentence is already supported by a
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Current ref 92 is just a titled link, needs author, publisher, last accessdate, etc.
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And the same for Ccurrent ref 29 (Gibbs again) and 38 (Gibbs again) and 44 (Chase)
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Otherwise, images are verifiably in the public domain or appropriately licensed.
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also what makes this a reliable source? Same for current ref 69...(Both O'Connor)
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Current ref 57 (Egan).. lacks a publisher. What makes this a relaible source?
863:: reference for the design (i.e. is this how Fizeau notched wheel is set up)? 610:
I've removed it from the citations, only leaving it in the external links. ―
200:. Most of the existing alt text is good, but I see problems with two images. 1250:
I'm not sure. My experiences with most wikiprojects hasn't been impressive.β€”
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Otherwise, sources look okay, links checked out with the link checker tool.
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It wasn't those, it's the NIST, etc. type abbreviations I was referring to.
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Newspapers titles in the references should be in italics. If you're using
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The first paragraph of the "Earth-bound techniques" section needs a cite.
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Yes, thanks, it all looks good now. You're right about "Sun" of course.
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Common terms like air, water and glass usually don't need to be linked.
869:: labels and explanation of the symbols would help in the Description. 857:: labels and explanation of the symbols would help in the Description. 1034:β€”all significant issues addressed. Article appears to be FA quality.β€” 39:
Subsequent comments should be made on the article's talk page or in
1455:; please check the disambiguation links identified in the toolbox. 969:
Weird, I'm somewhat sure it used to work. Maybe the switching from
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1972 article when I'm back to the university (presumably Monday).
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Some of the images here, in particular this one, are the work of
777:). Other sites used it with an explicit statement of permission. 273:
Current ref 10, the Hall, Hall and McCall ref lacks a page number
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has alt text that can't be verified from the image itself (see
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Fixed (one of them by changing the target of a redirect!). ―
217:); troublesome phrases include "Io", "Jupiter", and "Earth". 182:
Alt text is largely present (thanks), but it is missing for
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You have "group velocity" linked twice in the same section.
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Current ref 24 Roberts, et al. ... Same deal as above.
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Talk:Speed of light#Laboratory demonstration section
949:On another note (not of copyright but aesthetics), 111:
Featured article candidates/Speed of light/archive3
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Featured article candidates/Speed of light/archive2
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Featured article candidates/Speed of light/archive1
312:I suppose everyone knows what "US" mean; as for 2p 1487:The above discussion is preserved as an archive. 1082:The jargon term "group index" is not explained. 986:Yeah, apparently it's a new bug. There are two 973:to a fixed size had something to do with it. ― 124:Featured article review/Speed of light/archive2 119:Featured article review/Speed of light/archive1 43:. No further edits should be made to this page. 1413:Did you want to mention the GRB 090510 result? 914:I've asked that he be temporarily unbanned. ― 1493:No further edits should be made to this page. 1391:I've tried to resurrect that discussion. See 1179:Is "Until the early modern period" better? ― 29:The following is an archived discussion of a 8: 1340:I've tried to clarify that. Is it OK now? ― 384:What makes the following reliable sources? 1215:The Cavity resonance section needs citing. 951:File:Speed of light from Earth to Moon.gif 395:Talk:Speed of light/Archive 12#Took it out 128: 41:Knowledge talk:Featured article candidates 691:Current ref 99 (IAUWG...) lacks publsiher 388:http://www.quadibloc.com/other/cnv03.htm 626:Current ref 67 lacks a last accessdate, 131: 116: 98: 727:I'm going to address the rest now. ― 18:Knowledge:Featured article candidates 7: 800:I've replaced it with a drawing. ― 185:File:Relativity of Simultaneity.svg 160:as it exists now is good enough. ― 24: 1333:I'll take a look at the Evenson 631:These citations are produced by 93:, has already been on main page 468:I followed the instruction at 1: 760:TimothyRias has done that. ― 1478:17:09, 23 January 2010 (UTC) 1465:15:33, 23 January 2010 (UTC) 1447:18:55, 12 January 2010 (UTC) 1428:23:38, 13 January 2010 (UTC) 1404:19:48, 17 January 2010 (UTC) 1387:16:34, 14 January 2010 (UTC) 1365:18:59, 18 January 2010 (UTC) 1349:12:34, 18 January 2010 (UTC) 1303:13:10, 18 January 2010 (UTC) 1290:20:57, 15 January 2010 (UTC) 1262:00:03, 15 January 2010 (UTC) 1246:16:48, 14 January 2010 (UTC) 1229:23:38, 13 January 2010 (UTC) 1208:23:38, 13 January 2010 (UTC) 1188:23:11, 12 January 2010 (UTC) 1164:01:53, 14 January 2010 (UTC) 1146:23:38, 13 January 2010 (UTC) 1124:23:11, 12 January 2010 (UTC) 1095:23:11, 12 January 2010 (UTC) 1075:23:11, 12 January 2010 (UTC) 1046:19:25, 18 January 2010 (UTC) 1022:20:34, 12 January 2010 (UTC) 1009:20:06, 12 January 2010 (UTC) 982:19:54, 12 January 2010 (UTC) 963:13:54, 12 January 2010 (UTC) 944:13:54, 12 January 2010 (UTC) 923:23:38, 13 January 2010 (UTC) 910:19:28, 13 January 2010 (UTC) 886:10:46, 13 January 2010 (UTC) 840:02:45, 15 January 2010 (UTC) 828:File:Prism-rainbow-black.svg 822:12:56, 14 January 2010 (UTC) 809:23:38, 13 January 2010 (UTC) 796:12:11, 13 January 2010 (UTC) 769:19:54, 12 January 2010 (UTC) 736:17:19, 11 January 2010 (UTC) 723:16:51, 11 January 2010 (UTC) 704:20:15, 11 January 2010 (UTC) 679:20:28, 11 January 2010 (UTC) 657:19:54, 12 January 2010 (UTC) 644:19:57, 11 January 2010 (UTC) 635:; I'm going to ask there. ― 619:22:10, 14 January 2010 (UTC) 606:19:53, 11 January 2010 (UTC) 584:20:28, 11 January 2010 (UTC) 548:09:11, 12 January 2010 (UTC) 533:21:07, 11 January 2010 (UTC) 508:17:37, 11 January 2010 (UTC) 491:17:19, 11 January 2010 (UTC) 450:20:58, 22 January 2010 (UTC) 406:20:46, 11 January 2010 (UTC) 374:19:30, 11 January 2010 (UTC) 347:17:37, 11 January 2010 (UTC) 334:17:19, 11 January 2010 (UTC) 299:21:15, 11 January 2010 (UTC) 286:19:41, 11 January 2010 (UTC) 256:00:15, 12 January 2010 (UTC) 242:11:56, 11 January 2010 (UTC) 228:03:43, 11 January 2010 (UTC) 169:16:59, 10 January 2010 (UTC) 82:16:59, 10 January 2010 (UTC) 1066:Unlinked the second one. ― 855:File:Stellar aberration.JPG 430:American Journal of Physics 191:File:Stellar aberration.JPG 31:featured article nomination 1510: 670:Done. (Did I miss any?) ― 575:Done. (Did I miss any?) ― 482:of Adelaide University. ― 1233:Unfortunately that user, 1490:Please do not modify it. 36:Please do not modify it. 867:File:Interferometer.JPG 352:replying to, and add a 203:File:Lorentz factor.svg 197:File:Interferometer.JPG 56:21:05, 25 January 2010 754:File:PrismAndLight.jpg 290:She's added it now. ― 179:Alt text done; thanks. 1353:Much better. Thanks.β€” 1476:(formerly Army1987) 1426:(formerly Army1987) 1402:(formerly Army1987) 1385:(formerly Army1987) 1347:(formerly Army1987) 1301:(formerly Army1987) 1288:(formerly Army1987) 1244:(formerly Army1987) 1227:(formerly Army1987) 1206:(formerly Army1987) 1186:(formerly Army1987) 1144:(formerly Army1987) 1122:(formerly Army1987) 1093:(formerly Army1987) 1073:(formerly Army1987) 1020:(formerly Army1987) 1007:(formerly Army1987) 980:(formerly Army1987) 921:(formerly Army1987) 820:(formerly Army1987) 807:(formerly Army1987) 767:(formerly Army1987) 734:(formerly Army1987) 702:(formerly Army1987) 677:(formerly Army1987) 655:(formerly Army1987) 642:(formerly Army1987) 617:(formerly Army1987) 604:(formerly Army1987) 582:(formerly Army1987) 531:(formerly Army1987) 489:(formerly Army1987) 404:(formerly Army1987) 372:(formerly Army1987) 332:(formerly Army1987) 297:(formerly Army1987) 284:(formerly Army1987) 240:(formerly Army1987) 215:WP:ALT#Verifiability 167:(formerly Army1987) 80:(formerly Army1987) 830:checks out fine. 826:Replacement image 903: 633:Template:MacTutor 515:"P+Gibbs"+physics 445: 157: 156: 85: 1501: 1492: 999: 993: 972: 899: 892:User:Brews ohare 570: 564: 477: 471: 448: 446: 443: 439: 432:may be helpful. 363: 359: 355: 129: 94: 73:Nominator(s): ― 71: 48:The article was 38: 1509: 1508: 1504: 1503: 1502: 1500: 1499: 1498: 1497: 1488: 997: 991: 970: 908: 861:File:Fizeau.JPG 747:Image concerns: 568: 562: 475: 469: 442: 435: 433: 361: 357: 353: 319: 315: 210:File:Roemer.jpg 115: 88: 68: 34: 22: 21: 20: 12: 11: 5: 1507: 1505: 1496: 1495: 1483: 1482: 1481: 1480: 1433: 1432: 1431: 1430: 1410: 1409: 1408: 1407: 1406: 1373: 1372: 1371: 1370: 1369: 1368: 1367: 1326: 1325: 1324: 1323: 1322: 1321: 1320: 1319: 1318: 1266: 1265: 1264: 1212: 1211: 1210: 1192: 1191: 1190: 1171: 1170: 1169: 1168: 1167: 1166: 1159:encyclopedic.β€” 1151: 1150: 1149: 1148: 1128: 1127: 1126: 1099: 1098: 1097: 1079: 1078: 1077: 1058: 1057: 1029: 1028: 1027: 1026: 1025: 1024: 932: 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Index

Knowledge:Featured article candidates
featured article nomination
Knowledge talk:Featured article candidates
SandyGeorgia

Speed of light
A.
16:59, 10 January 2010 (UTC)
WP:FFA
Featured article candidates/Speed of light/archive1
Featured article candidates/Speed of light/archive2
Featured article candidates/Speed of light/archive3
Featured article review/Speed of light/archive1
Featured article review/Speed of light/archive2
Analysis
Citation bot
External links
A.
16:59, 10 January 2010 (UTC)
File:Relativity of Simultaneity.svg
File:Stellar aberration.JPG
File:Interferometer.JPG
File:Lorentz factor.svg
File:Roemer.jpg
WP:ALT#Verifiability
Eubulides
talk
03:43, 11 January 2010 (UTC)
A.
11:56, 11 January 2010 (UTC)

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