1. Antoine Henri Becquerel Antoine Henri Becquerel (18521908) On the rays emitted by phosphorescence. read before the French Academy of Science 24 Feb. 1896 (Comptes Rendus122, 420 (1896)) translated by Carmen Giunta In an http://maple.lemoyne.edu/faculty/giunta/becquerel.html

Antoine Henri Becquerel (1852-1908) On the rays emitted by phosphorescence [read before the French Academy of Science 24 Feb. 1896 ( Comptes Rendus , 420 (1896)) translated by Carmen Giunta] In an earlier session, M. Chairman Henry announced that phosphorescent zinc sulfide placed in the path of rays emanating from a Crookes tube augmented the intensity of rays passing through the aluminum. Elsewhere, M. Niewenglowski recognized that commercial phosphorescent calcium sulfide emits rays which pass through opaque bodies. This fact extends to various phosphorescent bodies, and in particular to uranium salts whose phosphorescence has a very brief duration. With the double sulfate of uranium and potassium, of which I have a few crystals forming a thin transparent crust, I was able to perform the following experiment: One places on the sheet of paper, on the outside, a slab of the phosphorescent substance, and one exposes the whole to the sun for several hours. When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative. If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative. One can repeat the same experiments placing a thin pane of glass between the phosphorescent substance and the paper, which excludes the possibility of chemical action due to vapors which might emanate from the substance when heated by the sun's rays.

2. Antoine Henri Becquerel Antoine Henri Becquerel. Antoine Henri Becquerel (18521919) was a French physicistwhose research led him to the study of fluorescence in minerals. http://www.cartage.org.lb/en/themes/Arts/Graphicartists/Prints/scistamp/modphys1

3. Antoine Henri Becquerel Antoine Henri Becquerel (18521908). On the rays emitted by phosphorescence.read before the French Academy of Science 24 Feb. 1896 http://webserver.lemoyne.edu/faculty/giunta/becquerel.html

Antoine Henri Becquerel (1852-1908) On the rays emitted by phosphorescence [read before the French Academy of Science 24 Feb. 1896 ( Comptes Rendus , 420 (1896)) translated by Carmen Giunta] In an earlier session, M. Chairman Henry announced that phosphorescent zinc sulfide placed in the path of rays emanating from a Crookes tube augmented the intensity of rays passing through the aluminum. Elsewhere, M. Niewenglowski recognized that commercial phosphorescent calcium sulfide emits rays which pass through opaque bodies. This fact extends to various phosphorescent bodies, and in particular to uranium salts whose phosphorescence has a very brief duration. With the double sulfate of uranium and potassium, of which I have a few crystals forming a thin transparent crust, I was able to perform the following experiment: One places on the sheet of paper, on the outside, a slab of the phosphorescent substance, and one exposes the whole to the sun for several hours. When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative. If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative. One can repeat the same experiments placing a thin pane of glass between the phosphorescent substance and the paper, which excludes the possibility of chemical action due to vapors which might emanate from the substance when heated by the sun's rays.

4. MSN Encarta - Search Results - Becquerel Antoine Henri Encarta Search results for becquerel antoine henri . Page 1 of 1. 5. Magazineand news articles about becquerel antoine henri *. Encarta Magazine Center. http://encarta.msn.com/Becquerel_Antoine_Henri.html

MSN Home My MSN Hotmail Shopping ... Money Web Search: logoImg('http://sc.msn.com'); Encarta Subscriber Sign In Help Home ... Upgrade to Encarta Premium Search Encarta Encarta Search results for "Becquerel Antoine Henri" Page of 1 Exclusively for MSN Encarta Premium Subscribers Becquerel, Antoine Henri Article—Encarta Encyclopedia Becquerel, Antoine Henri (1852-1908), French physicist and Nobel laureate, who discovered radioactivity in uranium. He was the son of Alexandre... related items discovery of radioactivity early attempts at medical treatments with radium element studied historical context of research ... Antoine Henri Becquerel Picture—Encarta Encyclopedia Picture from Encarta Encyclopedia Louis Antoine Henri de Bourbon-Conde, Duc d’ Enghien Article—Encarta Encyclopedia Enghien, Louis Antoine Henri de Bourbon-Conde, Duc d’ (1772-1804), French nobleman, grandson of Louis Joseph de Bourbon, prince de Cond©. Louis... Nobel Prize, Physics Chart or Table—Encarta Encyclopedia Found in the Nobel Prize Winners table Magazine and news articles about Becquerel Antoine Henri Encarta Magazine Center Search the Encarta Magazine Center for magazine and news articles about "Becquerel Antoine Henri" Books about Becquerel Antoine Henri Exclusively for MSN Encarta Premium Subscribers Page of 1 Results from MSN Search Advertisement Search Results Feedback document.write('');

5. BECQUEREL ANTOINE HENRI (1852-1908) Translate this page becquerel antoine henri (1852-1908). Né le 15 décembre 1852 à Paris,Henri Becquerel était le fils d’Alexandre Edmond et le http://histoirechimie.free.fr/Lien/BECQUEREL.htm

BECQUEREL ANTOINE HENRI (1852-1908) er

6. WIEM: Becquerel Antoine Henri becquerel antoine henri (18521908), wybitny chemik i fizyk francuski, wnukAntoine a Cesara, od 1895 profesor École Polytechnique w Paryzu http://wiem.onet.pl/wiem/0002ce.html

WIEM 2004 - zobacz now± edycjê encyklopedii! Kup abonament i encyklopediê na CD-ROM, sprawd¼ ofertê cenow±! Oferta specjalna abonamentów dla szkó³ i instytucji! Uwaga! Przedstawione poni¿ej has³o pochodzi z archiwalnej edycji WIEM 2001! Prace redakcyjne nad edycj± 2001 zosta³y zakoñczone. Zapraszamy do korzystania z nowej, codziennie aktualizowanej i wzbogacanej w nowe tre¶ci edycji WIEM 2004 Fizyka, Chemia, Francja Becquerel Antoine Henri Becquerel Antoine Henri polaryzacji ¶wiat³a i jego przenikania przez kryszta³y, interesowa³ siê magnetyzmem ziemskim oraz fosforescencj± powstaj±c± pod wp³ywem promieniowania podczerwonego.Badaj±c luminescencjê soli uranu (1896), odkry³ zjawisko promieniotwórczo¶ci naturalnej , za co otrzyma³ w 1903 Nagrodê Nobla (za badania nad odkrytym przez niego zjawiskiem nagrodê otrzymali równie¿ M. Sk³odowska-Curie i  P. Curie 1899-1900 mierz±c odchylenie promieniowania beta w polu magnetycznym i elektrycznym, zidentyfikowa³ je jako strumieñ elektronów odkrytych w tym czasie przez J. J. Thomsona

7. Antoine Henri Becquerel - Encyclopedia Article About Antoine Henri Becquerel. Fr encyclopedia article about Antoine Henri Becquerel. Antoine Henri Becquerelin Free online English dictionary, thesaurus and encyclopedia. http://encyclopedia.thefreedictionary.com/Antoine Henri Becquerel

Dictionaries: General Computing Medical Legal Encyclopedia Antoine Henri Becquerel Word: Word Starts with Ends with Definition Antoine Henri Becquerel December 15 December 15 is the 349th day of the year (350th in leap years) in the Gregorian calendar. There are 16 days remaining. Events 687 - St. Sergius I becomes Pope 1702 - Forty-seven ronin, formerly in the service of Asano Naganori, assault the household of Kira Yoshinaka, and kill him in vengence for their lord. Their display of the ideals of bushido becomes a national legend. Click the link for more information. Centuries: 18th century - 19th century - 20th century Decades: 1800s 1810s 1820s 1830s 1840s - Years: 1847 1848 1849 1850 1851 - Events January 14 - President Louis-Napoleon Bonaparte proclaims a new constitution for the French Second Republic. January 17 - United Kingdom recognizes independence of the Transvaal Click the link for more information. August 25 August 25 is the 237th day of the year in the Gregorian Calendar (238th in leap years), with 129 days remaining. Events 1580 - Battle of Alcantara. Spain defeats Portugal.

8. Henri Becquerel Antoine Henri Becquerel (December 15, 1852 August 25, 1908) was a Frenchphysicist, Nobel laureate, and one of the discoverers of radioactivity. http://www.fact-index.com/h/he/henri_becquerel.html

Main Page See live article Alphabetical index Henri Becquerel Antoine Henri Becquerel December 15 August 25 ) was a French physicist , Nobel laureate, and one of the discoverers of radioactivity. In , Becquerel accidentally discovered radioactivity while investigating phosphorescence in uranium salts. In he shared the Nobel prize for Physics with Pierre and Marie Curie in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity The SI unit for radioactivity, the becquerel (Bq) is named after him. External link Henri Becquerel - Biography About Henri Becquerel This article is from Wikipedia . All text is available under the terms of the GNU Free Documentation License

9. Recherche Inventeur - Invention Translate this page Ø Site(s) trouvé(s) 1 à 1. 792. Titre becquerel antoine henri, Date ( ),Classé 4. Inventeur ( becquerel antoine henri ), Lieu ( Paris ). http://www.awake2life.com/ericc/phpmyannu/search.php3?mots=Becquerel Antoine&and

10. Antoine Henri Becquerel - Enciclopedia Libre Translate this page Antoine Henri Becquerel. (Redirigido desde Henri Becquerel en Español.Antoine Henri Becquerel Físico y Premio Nobel francés. Nació el http://enciclopedia.us.es/index.php/Henri_Becquerel

Enciclopedia Libre Universal en Español Cambios recientes Edita esta página Historial ... Aviso Legal No has entrado Registrarse/Entrar Ayuda Antoine Henri Becquerel (Redirigido desde Henri Becquerel Artículo de la Enciclopedia Libre Universal en Español Antoine Henri Becquerel Físico y Premio Nobel francés Nació el 15 de diciembre de en París , hijo de Alexandre Becquerel (que estudió la luz y la fosforescencia e inventó la fosforoscopia ) y nieto de Antoine César Becquerel , uno de los fundadores de la electroquímica . Estudió y se doctoró en Ciencias en la Escuela Politécnica de la capital francesa. Fue profesor del Museo de Historia Natural en 1892 y de la École Polytechnique en 1895. En el año 1896 descubrió accidentalmente el fenómeno de la radiactividad durante su investigación sobre la fluorescencia. Las sales de uranio emitían una radiación capaz de atravesar papeles negros y otras sustancias opacas a la luz ordinaria. Estos rayos se denominaron en un principio rayos B. en honor de su descubridor. Además realizó investigaciones sobre la fosforescencia, espectroscopia y la absorción de la luz. En el año

11. Antoine Henri Becquerel - Enciclopedia Libre Translate this page Antoine Henri Becquerel. Artículo de la Enciclopedia Libre Universal en Español.Antoine Henri Becquerel Físico y Premio Nobel francés. http://enciclopedia.us.es/index.php/Antoine_Henri_Becquerel

Enciclopedia Libre Universal en Español Cambios recientes Edita esta página Historial ... Aviso Legal No has entrado Registrarse/Entrar Ayuda Antoine Henri Becquerel Artículo de la Enciclopedia Libre Universal en Español Antoine Henri Becquerel Físico y Premio Nobel francés Nació el 15 de diciembre de en París , hijo de Alexandre Becquerel (que estudió la luz y la fosforescencia e inventó la fosforoscopia ) y nieto de Antoine César Becquerel , uno de los fundadores de la electroquímica . Estudió y se doctoró en Ciencias en la Escuela Politécnica de la capital francesa. Fue profesor del Museo de Historia Natural en 1892 y de la École Polytechnique en 1895. En el año 1896 descubrió accidentalmente el fenómeno de la radiactividad durante su investigación sobre la fluorescencia. Las sales de uranio emitían una radiación capaz de atravesar papeles negros y otras sustancias opacas a la luz ordinaria. Estos rayos se denominaron en un principio rayos B. en honor de su descubridor. Además realizó investigaciones sobre la fosforescencia, espectroscopia y la absorción de la luz. En el año

12. Henri Becquerel Translate this page Henri becquerel antoine henri Becquerel (15 de diciembre de 1852 - 25de agosto de 1908), físico francés. Descubridor de una nueva http://www.guajara.com/wiki/es/wikipedia/h/he/henri_becquerel.html

Henri Becquerel Antoine Henri Becquerel 15 de diciembre de 25 de agosto de físico francés . Descubridor de una nueva propiedad de la materia que recibe el nombre de " radiactividad Descubrió por accidente el fenómeno de la radiactividad en el transcurso de su investigación sobre la fluorescencia. Al colocar sales de uranio en una placa fotográfica en una zona oscura, comprobó que la placa se había ennegrecido. Esto demuestra que el uranio debe emitir su propia energía, a la que posteriormente se denominó radiactividad. En compartió el Premio Nobel de física con Pierre y Marie Curie Ver Lista de artículos relacionados con Francia Tagoror.com CineBSO Radioaficionados.net ... Deranet El contenido de Wikipedia se publica bajo la Datos de Contacto

13. ANTOINE HENRI BECQUEREL ANTOINE HENRI BECQUEREL. 15. 12. 1852 25. 8. 1908. francouzský fyzik.Nositel Nobelovy ceny s manžely Curieovýmiz roku 1905. Narodil se 15. http://vedci.wz.cz/Osobnosti/Becquerel_A_H.htm

ANTOINE HENRI BECQUEREL francouzský fyzik Nositel Nobelovy ceny s manžely Curieovými z roku 1905. Narodil se 15. prosince 1852 v Paøíži. Jeho otec i dìdeèek byli pøedními francouzskými fyziky. Vystudoval paøížskou polytechniku. Pozdìji se specializoval na stavbu silnic a mostù. Jeho hlavním zájmem zùstala fyzika. V roce 1895 se stal profesorem fyziky na polytechnice. Zde uèinil svùj nejvýznamnìjší objev. Roku 1896 objevil pøirozenou radioaktivitu. Zajímavé je, že jeho objev je vlastnì následkem jeho chybné hypotézy a náhody. Becquerel se totiž dozvìdìl o objevu paprskù X profesorem Röntgenem a formuloval hypotézu, že vlastnost vysílat pronikavé záøení úzce souvisí s fosforescencí. Tuto hypotézu se rozhodl prokázat experimentem tak, že ozaøoval rùzné látky sluneèním svìtlem a pak je nechal pùsobit na fotografickou desku, aby zjistil jestli opìt vyzaøují - fosforeskují. Kontrolní vzorky neozaøoval, takže by nemìly fosforeskovat. Jako jednu z experimentálních látek si Becquerel (náhodnì?) vybral uranovou sùl, u které se ukázalo, že záøily oba vzorky, bez ohledu na to, jestli byly pøedem osvíceny. Teorie o fosforescenci se hroutila, ale radioaktivita byla objevena. Na poèest profesora Becquerela nese základní jednotka aktivity jeho jméno. Byl èlenem francouzské akademie vìd. Zemøel 25. srpna 1908 v Le Croisic.

14. Antoine Henri Becquerel Antoine Henri Becquerel. (15. prosince 1852 – 25. srpna 1908). Nobelovucenu získal v roce 1903 za objev prírodní radioaktivity. http://www.mujweb.cz/www/nobelfyzika/1903a.htm

Antoine Henri Becquerel (15. prosince 1852 – 25. srpna 1908) Nobelovu cenu získal v roce 1903 za objev pøírodní radioaktivity. Francouzský fyzik Antoine Henri Becquerel se narodil v roce 1852 a již od malièka mìl velmi blízko k fyzice, nebo jeho otec i dìdeèek byli fyzikové. Becquerel vystudoval v roce 1877 polytechniku v Paøíži a po specializaci na stavební škole získal titul inženýra. V roce 1888 obhájil disertaèní práci vìnovanou absorpci svìtla v krystalech a od roku 1895 až do konce svého života byl profesorem fyziky na paøížské polytechnice. Jeho první práce byly z oblasti fyzikální optiky a od roku 1882 zkoumal fosforeskující a fluoreskující látky. Právì pøi zkoumání tìchto látek došlo roku 1896 k jeho životnímu objevu. Mezi zkoumanými látkami byla také uranová sùl, u níž prokázal existenci záøení, které bylo vysíláno pøímo tímto nerostem a nikoli Sluncem vybuzenou fluorescencí. Na základì tohoto pokusu Becquerel zaèal studovat radiaci minerálù a zjistil, že je obdobná paprskùm X, nebo proniká látkou a ionizuje vzduch. Tím vlastnì objevil pøírodní radioaktivitu, což je vlastnost nìkterých prvkù vysílat radioaktivní záøení. V roce 1899 prokázal, že toto záøení lze z pøímého smìru odklonit magnetickým polem, takže musí být alespoò z èásti tvoøeno nabitými èásticemi. Na jeho poèest je pojmenována zákonná jednotka soustavy SI aktivita tìlesa – Becquerel (Bq) je aktivita takového množství radioaktivní látky, ve kterém dojde za 1 sekundu k jedné jaderné pøemìnì.

15. Henri Becquerel Antoine Henri Becquerel, French physicist. Information about Henri Becquerel withuseful links and basic facts. Antoine Henri Becquerel, French physicist. http://www.fastload.org/he/Henri_Becquerel.html

Henri Becquerel Home Up About 'Henri Becquerel' Advertisement Antoine Henri Becquerel , French physicist. Born 15 December in Paris , died 25 August in Le Croisic, France. In , Becquerel accidentally discovered radioactivity while investigating phosphorescence[?] in uranium salts. In he shared Nobel prize for Physics with Pierre and Marie Curie in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity This article is licensed under the GNU Free Documentation License You may copy and modify it as long as the entire work (including additions) remains under this license. You must provide a link to http://www.gnu.org/copyleft/fdl.html To view or edit this article at Wikipedia, follow this link

16. Antoine Henri Becquerel - Wikipedia NL Antoine Henri Becquerel. Antoine Henri Becquerel (15 december 1852 25 augustus1908) Frans Natuurkundige. Henri Becquerel werd geboren in Parijs. http://nl.wikipedia.org/wiki/Antoine_Henri_Becquerel

Antoine Henri Becquerel Antoine Henri Becquerel 15 december 25 augustus Frans Natuurkundige Henri Becquerel werd geboren in Parijs . In ontdekte hij bij toeval radioactiviteit terwijl hij fosforescentie in uraniumverbindingen onderzocht. In kreeg hij de Nobelprijs voor de natuurkunde met Pierre en Marie Curie in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity De SI eenheid voor radioactiviteit, de Becquerel Bq ) is naar hem vernoemd. Becquerel stierf op 55-jarige leeftijd in Le Croisic, Frankrijk. Views artikel overleg Bewerk geschiedenis Personal tools Aanmelden Plaatsbepaling Hoofdpagina Gebruikersportaal In het nieuws Recente wijzigingen ... Financieel bijdragen Zoeken trukendoos Referenties Verwante wijzigingen Speciale pagina's Andere talen Deutsch English Esperanto Svenska De laatste wijziging op deze pagina vond plaats op 20 apr 2004 18:23. De inhoud van wikipedia is zonder enige vorm van garantie beschikaar onder de GNU Free Documentation License Over Wikipedia

17. Antoine Henri Becquerel - Wikipedija Antoine Henri Becquerel. Iz Wikipedije, proste enciklopedije. Antoine Henri Becquerel,francoski fizik, * 15. december 1852, Pariz, Francija, † 25. http://sl.wikipedia.org/wiki/Antoine_Henri_Becquerel

Antoine Henri Becquerel Iz Wikipedije, proste enciklopedije. Antoine Henri Becquerel francoski fizik 15. december Pariz ... Loire Inferieur Leta je Becquerel pri preučevanju fosforescence uranovih soli po naključju odkril naravno radioaktivnost , za kar je leta skupaj s Pierrom Curiejem in Marie Skłodowsko-Curie prejel Nobelovo nagrado za fiziko Views Članek Pogovor Uredi Zgodovina strani Personal tools Vpis Navigacija Glavna stran Portal občestva Trenutni dogodki Trenutne spremembe ... Denarni prispevki Išči Orodna škatla Kaj je povezano sem Sorodne spremembe Posebne strani Drugi jeziki Deutsch English Esperanto Nederlands ... Svenska Zadnja sprememba 12:04, 23 feb 2004. Vsebina je na voljo pod GNU Free Documentation License O Wikipediji Zanikanja odgovornosti

18. Antoine Henri Becquerel Definition Of Antoine Henri Becquerel. What Is Antoine H Definition of Antoine Henri Becquerel in the Dictionary and Thesaurus. AntoineHenri Becquerel. Word Word. http://www.thefreedictionary.com/Antoine Henri Becquerel

Dictionaries: General Computing Medical Legal Encyclopedia Antoine Henri Becquerel Word: Word Starts with Ends with Definition Noun Antoine Henri Becquerel - French physicist who discovered that rays emitted by uranium salts affect photographic plates (1852-1908) Becquerel Henri Becquerel physicist - a scientist trained in physics Legend: Synonyms Related Words Antonyms Some words with "Antoine Henri Becquerel" in the definition: Antoine Laurent Lavoisier Antoine Lavoisier Becquerel Becquerel rays ... van de Velde Previous General Dictionary Browser Next Antizymotic antler antler moth ... Anton Pavlovich Chekov Full Dictionary Browser Antoine de Bourbon (enc.) Antoine de Jussieu (enc.) Antoine De La Monthe Cadillac (enc.) Antoine de la Mothe, Sieur de Cadillac (enc.) Antoine de Laloubère (enc.) Antoine de Lamothe Cadillac (enc.) Antoine de Rivarol (enc.) Antoine de Saint-Exupery (enc.) Antoine de Saint-Exupéry (enc.) Antoine de St Exupery (enc.) Antoine Denert (enc.) Antoine Domino Antoine Domino Jr. (enc.) Antoine Drouot (enc.) Antoine Eugène Alfred Chanzy (enc.)

19. Antoine Henri Becquerel - Wikipedia Translate this page Antoine Henri Becquerel. Origem Wikipedia, a enciclopédia livre.Físico Francês, filho de Alexandre-Edmond Becquerel, Antoine http://pt.wikipedia.org/wiki/Antoine_Henri_Becquerel

Antoine Henri Becquerel Origem: Wikipedia, a enciclop©dia livre. F­sico Francªs , filho de Alexandre-Edmond Becquerel Antoine Becquerel nasceu em Paris a 15 de Dezembro de 1852 e morreu a 25 de Agosto de 1908 em Croisic, na Bretanha . Estudou na ‰cole Polytechnique e era "engenheiro de pontes e cal§adas". Ensinou F­sica na ‰cole Polytechnique e no Museu Nacional de Hist³ria Natural. Continuou os trabalhos dos seus pai e av´, descobrindo em 1896 a radioactividade dos sais de ur¢nio . Esta importante descoberta valeu-lhe a atribui§£o do Pr©mio Nobel da F­sica em 1903, juntamente com o casal Pierre e Marie Curie . Foi membro da Academia das Ciªncias Francesa. Views Artigo Editar Personal tools Entrar Navega§£o P¡gina principal Portal comunit¡rio Eventos atuais Mudan§as Recentes ... Donativos Busca Ferramentas Artigos afluentes Novidades relacionadas P¡ginas especiais Esta p¡gina foi modificada pela ºltima vez em 15:28, 20 Fev 2003. Esta p¡gina est¡ sob GNU Free Documentation License Sobre a Wikip©dia

20. Radioactivity: Historical Figures Focuses on four primary figures in the development of the understanding of nuclear structure and radioactivity, namely Wilhelm Conrad Roentgen, antoine henri becquerel, Marie Sklodowska Curie, and Ernest Rutherford. http://www.accessexcellence.org/AE/AEC/CC/historical_background.html

Radioactivity: Historical Figures Access Excellence Classic Collection This article will focus on the efforts of four scientists: Wilhelm Conrad Roentgen, Antoine Henri Becquerel, Marie Sklodowska Curie, and Ernest Rutherford. It emphasizes their contributions to the elucidation of radioactivity and the "key" experiments they performed pertaining to their discoveries. The biographies and photographs are adapted from The Health Physics Society Centennial Calendar by permission of the Health Physics Society. Wilhelm Rontgen ca. 1895. Inset photo: Radiograph of Frau Rontgen's hand. Wilhelm Conrad Roentgen (1845-1923) On November 8, 1895, at the University of Wurzburg, Wilhelm Roentgen's attention was drawn to a glowing fluorescent screen on a nearby table. Roentgen immediately determined that the fluorescence was caused by invisible rays originating from the partially evacuated glass Hittorf-Crookes tube he was using to study cathode rays (i.e., electrons). Surprisingly, these mysterious rays penetrated the opaque black paper wrapped around the tube. Roentgen had discovered X rays, a momentous event that instantly revolutionized the field of physics and medicine. However, prior to his first formal correspondence to the University Physical-Medical Society, Roentgen spent two months thoroughly investigating the properties of X rays. Silvanus Thompson complained that Roentgen left "little for others to do beyond elaborating his work." For his discovery, Roentgen received the first Nobel Prize in physics in 1901. When later asked what his thoughts were at the moment of his discovery, he replied "I didn't think, I investigated. "It was the crowning achievement in a career beset by more than its share of difficulties.

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