Fil:Davisson and Germer.jpg

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Davisson_and_Germer.jpg ‎(334 × 339 billedpunkter, filstørrelse: 24 KB, MIME-type: image/jpeg)

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Beskrivelse

Beskrivelse
English: Clinton Joseph Davisson (left; 1881-1958) and Lester Halbert Germer (right; 1896-1971) in 1927, physicists who performed the davisson-Germer experiment in 1923-1927 at Bell Labs, that demonstrated the wave nature of matter theorized by Louis de Broglie in 1924.
Dato first published in 1927
Kilde Appears in Electronics magazine, McGraw-Hill Co., New York, Vol.8, No.9, September 1935, p.25 without attribution. This publication's copyright would have been renewed in 1963. The Online Books record of copyright renewals for Electronics lists no renewals. Therefore it was not renewed and is in the public domain
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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Clinton Davisson and Lester Germer, of the Davisson-Germer experiment

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Lester Germer

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Dato/tidMiniaturebilledeDimensionerBrugerKommentar
nuværende17. feb. 2006, 12:13Miniature af versionen fra 17. feb. 2006, 12:13334 × 339 (24 KB)ElectronClinton Joseph Davisson (left; 1881-1958) and Lester Halbert Germer (right; 1896-1971) in 1927. Author unknown, the photo was the first published in 1927 (more then 70-ty years ago)

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