21. Antoine Henri Becquerel. Biografía Translate this page antoine henri becquerel. Hijo y nieto de eminentes físicos (su abuelo antoine CésarB radiactividad espontánea fue galardonado con el premio nobel de Física http://www.canalsocial.com/biografia/fisica/becquerel.htm

Cine Vídeo Libros Música ... Radio Vivo Biografías Antoine Henri Becquerel B. publicó el resultado de sus investigaciones en gran número de artículos, principalmente en los Anales de Física y Química y en las Comunicaciones a la Acad. de Ciencias. En 1889 fue elegido miembro de la Acad. de Ciencias de Francia. También fue miembro de diversas Academias extranjeras, tales como la de Berlín y la dei Lincei. En 1900 fue nombrado Oficial de la Legión de Honor. B. murió en Le Croisic (Bretaña) el 25 ag. 1908. BIBL. : G. GAMOW, Biografía de la Física, Madrid 1962; Nobe[ Lectures: Physics 1901-1921, ed. EIsevier-Publishing Company, Amsterdam 1967. F. RUBIO ROYO. Cortesía de Editorial Rialp. Gran Enciclopedia Rialp, 1991 www. Canal Social .com Directorio de las mejores páginas de Internet Masnou Tecnología S.L. - Avda de Europa nº 34 - 28023 Madrid ( Spain ) Tel +34.91.799.45.00 - Fax +34.91.799.45.01

22. Becquerel henri becquerel 1903 nobel Laureate in Physics in recognition of Jean becquerel(18781953) Jean antoine becquerel and Heike Kamerlingh Onnes in a lab. http://www.geocities.com/bioelectrochemistry/becquerel.htm

b. March 7, 1788, Chatillon-sur-Loing (Loiret), France d. January 18, 1878, Paris, France d'application ) at Metz, which he left the following year with the rank of second lieutenant. During two and a half years, he fought under General Suchet in the Spanish campaign, distinguishing himself at several of the important sieges. Ill health obliged him to ask for a leave of absence. He was raised to the rank of captain, made Chevalier of the Legion of Honour, and nominated to the new position of assistant inspector of studies at the Polytechnic School. During the invasion of 1814 he resumed military service for a time, but was soon retired with the rank of chef de bataillon . A change of career then became necessary. After some hesitation, he settled down to the real work of his life, the study and advancement of the science of electricity. differential galvanometer increased he accuracy to be attained in the measurement of electrical resistances. He applied the results of his study of thermoelectricity to the construction of an electric thermometer and measured with it the temperature of the interior of animals, of the soil at different depths, of the atmosphere at different heights. He was also very much interested in questions of meteorology, climate, and agriculture. Becquerel enjoyed success in many areas. He helped validate Faraday's laws and conduct extensive investigations on the electrodeposition of metals with applications for metal finishing and metallurgy. Solar cell technology dates to 1839 when Antoine-Cesar Becquerel observed that shining light on an electrode submerged in a conductive solution would create an electric current.

23. Becquerel, (Antoine) Henri becquerel, (antoine) henri. French physicist. He was awarded the nobel Prize forPhysics in 1903 for his discovery of penetrating radiation coming from uranium http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0015933.html

HOME Internet Access Broadband Easter ... Travel Search the Web: serveAd("REFERENCE.HOME") REFERENCE ENCYCLOPAEDIA Hutchinson's Encyclopaedia Country Facts On This Day ... Wildlife TOOLS Car Insurance Cheap Flights Downloads Email By Phone ... What's On TISCALI About Us Business Services Investor Relations Contact Us Click a letter for the index A B C D ... Z Or search the encyclopaedia: HUTCHINSON ENCYCLOPEDIA Becquerel, (Antoine) Henri French physicist. He was awarded the Nobel Prize for Physics in 1903 for his discovery of penetrating radiation coming from uranium salts, the first indication of spontaneous radioactivity . He shared the award with Marie and Pierre Curie makeButtonNoSize("REFERENCE.HOME","R2") SITE MAP SERVICE STATUS HELP CONTACT US refreshads("REFERENCE.HOME",1); //refresh ads servePixl("REFERENCE.HOME"); //accipter 1x1 pixel

24. BECQUEREL, ANTOINE HENRI Biografía Translate this page becquerel, antoine henri. Hijo y nieto de eminentes físicos (su abuelo antoine CésarB radiactividad espontánea fue galardonado con el premio nobel de Física http://canalsocial.net/biografia/biografiacontenido.asp?nom=BECQUEREL, ANTOINE H

25. Antoine At ChemIndustry.com antoine henri becquerel was born in Paris on December 15, 1852, a member of a distinguishedfamily of scholars URL http//www.nobel.se80/physics/laureates http://www.chemindustry.com/chemnames/A/antoine.asp

Search the chemical world All Categories Chemical Suppliers Industry Services Resources Organizations Software Laboratory Supplies Academic Institutes Search Help Found 2463 Pages for antoine Featured Supplier (Ad.) Word Count: antoine (8193) History of Chemistry Technical info. United States Resource providing a list of outstanding chemists who made substantial contribution to the various areas of chemistry. For each chemist a review of his scientific work is given. URL: http://www.woodrow.org/teachers/chemistry/institutes/1992/ in English [ Translate in Category More relevant pages from this site ANTOINE LAURENT LAVOISIER URL: http://www.woodrow.org:80/teachers/chemistry/institutes/1992/Lavoisier.html Pagesize: 19K bytes - Language: English [ Translate General Chemistry Online Technical info. United States General Chemistry Online portal from Fred Senese at Frostburg State University, Maryland. URL: http://antoine.frostburg.edu/chem/senese/101/ in English [ Translate in Category More relevant pages from this site General Chemistry Online: Just Ask Antoine Antoine helps you find answers to your general chemistry questions. Includes a searchable database of hundreds of frequently asked questions in general URL: http://antoine.frostburg.edu:80/chem/senese/101/just-ask-antoine.shtml

26. Antoine Henri Becquerel It wasn't until 1971 that he was recognized for his important scientificwork; he received the nobel Prize in Physics for his contributions. http://stwi.weizmann.ac.il/g-junior/matmon/common_tools/scientists/gabor.htm

Gabor, Dennis Biography On June 5, 1900, Dennis Gabor was born to Bertalan and Adrienne Gabor in Budapest, Hungary. Dennis' father, an industrialist in mining, inspired and encouraged his young son to work in technology by telling him of great men like Thomas Edison and taking him to the Museum of Technology in Budapest. At the age of 15, Dennis' love for physics developed. He taught himself the work of modern scientists until he went to the university. He learned about Gabriel Lippmann's method of color photography, which later played a significant role in his work. Dennis built a laboratory at home with his younger brother, George, trying to recreate modern experiments. It wasn't until after serving in World War I for the Hungarian army that Gabor was able to attend the Technical University in Budapest. Unfortunately physics was not a realistic option at that time in Hungary, so he pursued a degree in electrical engineering. In 1921 he moved to Berlin to continue to study at the Technische Hochschule. This was convenient for Gabor because close by was the University of Berlin, where he could find many other brilliant scientists, including Albert Einstein. Although Gabor spent most of his time working in applied physics, in 1927 he received his doctorate in electrical engineering. The same year, he entered the professional world as a research scientist for the electrical firm Siemens and Halske. This is where he claims to have made his first successful inventions.

27. Antoine Henri Becquerel antoine henri becquerel (18521919) was a French physicist whose research led himto the He shared a nobel prize for his discovery with Pierre and Marie Curie http://www.cartage.org.lb/en/themes/Arts/scistamp/modphys1/04.html

Themes Arts Sci-Philately Modern Physics Part I Used with permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA, http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps Antoine Henri Becquerel (1852-1919) was a French physicist whose research led him to the study of fluorescence in minerals. He discovered radioactivity when studying uranium compounds, which, unlike other fluorescent substances, fogged photographic plates even without having been exposed to strong light. He shared a Nobel prize for his discovery with Pierre and Marie Curie in 1903.

28. Antoine Henri Becquerel becquerel, antoine henri Dictionary of Scientists R 925 B52 Who Did What R 920.02W622 Dictionary of Scientific Biography R 925 D56 nobel Prize Winners http://www.punahou.edu/libraries/cooke/becquerel.html

Library Home Library Catalog Online Resources Reference Sources ... Ing Learning Center Ghosts of Chemistry Past Becquerel, Antoine Henri Becquerel, Antoine Henri Books Encyclopedia of World Biography [R 920.02 En1] Science and Its Times [R 509 Sci2] Macmillan Encyclopedia of Chemistry [R 540.3 M22] Read, John. Through Alchemy to Chemistry Knight, David. Ideas in Chemistry Elsevier, American. Classical Scientific Papers – Chemistry Brock, William H. The Norton History of Chemistry Cobb, Cathy and Harold Goldwhite. Creations of Fire: Chemistry’s Lively History from Alchemy to the Atomic Age The Biographical Dictionary of Scientists [R 925 B52] Who Did What [R 920.02 W622] Dictionary of Scientific Biography [R 925 D56] Nobel Prize Winners [R 920.02 N66] The Golden Age of Science Internet Resources Nobel e-museum Biography Resource Center (Need username and password for trial) Last updated 09 April 2002 Home Libraries Cooke Chemistry ... Ghosts of Chemistry Past > Becquerel Quick Links: News Calendar Alumni E-mail Registry Mentoring at Punahou ... Punahou Phone Directory Search www.punahou.edu: Created by the Websters at the Punahou Educational Technology Center.

29. Iranian Journal Of Chemistry & Chemical Engineering antoinehenri becquerel French physicist who discovered radioactivity through hisinvestigations of uranium and other substances. In 1903 he shared the nobel http://213.176.24.20/chemist/Becquerel.htm

Email Search Join Shop Site map Site Tour Home B ecquerel, Henri b. Dec. 15, 1852, Paris, France d. Aug. 25, 1908, Le Croisic in full ANTOINE-HENRI BECQUEREL French physicist who discovered radioactivity through his investigations of uranium and other substances. In 1903 he shared the Nobel Prize for Physics with Pierre and Marie Curie. Becquered He was a member of a scientific family extending through several generations, the most notable being his grandfather Antoine-César Becquerel (1788-1878), his father, Alexandre-Edmond Becquerel (1820-91), and his son Jean Becquerel (1878-1953). Education and training After his early schooling at the Lycée Louis-le-Grand, Henri received his formal scientific education at the Ecole Polytechnique (1872-74) and engineering training at the Ecole des Ponts et Chaussées (Bridges and Highways School; 1874-77). In addition to his teaching and research posts, Becquerel was for many years an engineer in the Department of Bridges and Highways, being appointed chief engineer in 1894. His first academic situation was in 1876 as assistant teacher at the Ecole Polytechnique, where in 1895 he succeeded to the chair of physics. Concurrently, he was assistant naturalist to his father at the museum, where he also assumed the physics professorship upon his father's death.

30. Antoine Henri Becquerel Discovery of radioactivity; Fellow of the Royal Society; nobel Prize.He shared the nobel Prize with Pierre and Marie Curie. He worked http://www.sambal.co.uk/scientists/becquerel.htm

Sambal's Science Web Perhaps his discovery of radioactivity was an accident. He had left a container of uranium sulphate on top of an unexposed photographic plate. Although the plate was covered with lightproof material, radiation blackened the plate. He knew that the blackening had not been caused by light, so did an investigation to find out what had blackened it. Born: Paris - 15 th December 1852 Died: Croisic - 24 th August 1908 Physicist Discovery of radioactivity Fellow of the Royal Society Nobel Prize He shared the Nobel Prize with Pierre and Marie Curie. He worked at the cole Polytechnique , the cole des Ponts et Chauss es and became a member of the Acad mie des Sciences . He was also interested in phosphorescence, fluorescence and polarized light. Last revised 12 April 2001 For more information about these pages nigel@purchon.net

31. Science In Poland - Nobel Prize Laureates ? ? ? ? Results from searching of The nobel Foundation's database. The prize wasdivided, one half being awarded to becquerel, antoine henri, France, École http://main.amu.edu.pl/~zbzw/ph/sci/pl-nobel.html

Polish-origin Nobel Prize Laureates Year Person Discipline Maria SKLODOWSKA-CURIE Physics Henryk SIENKIEWICZ Literature Albert Abraham MICHELSON Physics Maria SKLODOWSKA-CURIE Chemistry Walther Hermann NERNST Chemistry Wladyslaw Stanislaw REYMONT Literature Tadeus REICHSTEIN Physiology or Medicine Maria GOEPPERT-MAYER Physics Shmuel Yosef AGNON Literature Andrew V. SCHALLY Physiology or Medicine Isaac Bashevis SINGER Literature Menachem BEGIN Peace Czeslaw MILOSZ Literature Roald HOFFMANN Chemistry Lech WALESA Peace Klaus von KLITZING Physics Georges CHARPAK Physics Shimon PERES Peace Józef ROTBLAT Peace Wislawa SZYMBORSKA Literature Günter GRASS Literature Günter BLOBEL Physiology or Medicine WHO NEXT? Results from searching of The Nobel Foundation 's database Please also visit page Famous Polish discoveres, travelers and scientists Physics 1903 The prize was divided, one half being awarded to: BECQUEREL, ANTOINE HENRI, France, École Polytechnique, Paris, * 1852, + 1908: "in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity" the other half jointly to: CURIE, PIERRE, France, École municipale de physique et de chimie industrielles, (Municipal School of Industrial Physics and Chemistry), Paris, * 1859, + 1906:

32. Nobel Peace Prize nobel Peace Prizes. 1903, antoine henri becquerel Fr Pierre Curie Fr Marie Curie,née Sklodowska Fr, Svante August Arrhenius Sw, Niels Ryberg Finsen Den http://din-timelines.com/1901s-npp.shtml

Din Timelines World History Timelines 1901s Home 1910s Home 1901s Links? Nobel Prizes ... Contact Us Can't find it? Try this search of the Web Search Page Search the Web. We are offering an exclusive Din Timelines version of the award winning Alexa Toolbar . The toolbar is loaded with useful information about every site on the web, like customer reviews, traffic rankings, and related links. Download this IE plugin and use the toolbar to help support Din Timelines. - Subscribe to Ancestry.com - Search Historical Records - Find Locality Resources - Build Your Family Tree ... - Shop Ancestry.com Search Our Indices: Timelines History Links History Bookshelf Amazon amazon books Dinosaurs in the Attic: An Excursion into the American Museum of Natural History by Douglas J. Preston Our Price: Once Upon a Time: Behind the Fairy Tale of Princess Grace and Prince Rainier by J. Randy Taraborrelli Our Price: Good to Great: Why Some Companies Make the Leap... and Others Don't by Jim Collins Our Price: Krakatoa : The Day the World Exploded: August 27, 1883 by Simon Winchester Our Price: The Civil War Trilogy: Gods and Generals/the Killer Angels/the Last Full Measure by Michael Shaara Our Price: top Vote for Us!

33. Chem 101, Spring 2000, Exam II, Turner This physicist discovered alpha rays and beta rays and received a nobel prize forhis efforts. antoine henri becquerel Marie Sklodowska Curie Albert Einstein http://colossus.chem.umass.edu/genchem/chem101/101_Exam_2_Turner_Sample_1.htm

Exam II: Sample #1 Prof. Everett Turner JavaScript is disabled The factory down south where U was separated from U was located in: Boston,Mass. Oak Ridge, Tenn. Buffalo, N.Y. Portland, ME. Key West, Fla. The physicist who corrected concluded that neutrons had split the uranium atom was: Mrs. Butterworth Marie Sklodowska Curie Margaret Thatcher Lise Meitner Madonna The chemist who first suggested that nuclear fission was possible, four years before anyone else in 1934, was: George W. Bush Albert Einstein Ida Noddack Marie Sklodowska Curie Madonna A fissile element that does not occur naturally that was used to make the "Fat Man" atomic bomb. chain reaction critical mass nuclear fission nuclear fusion plutonium A continuous series of nuclear reactions. chain reaction critical mass nuclear fission nuclear fusion plutonium The minimum mass of fissionable material needed to sustain a nuclear reaction. chain reaction critical mass nuclear fission nuclear fusion plutonium The process of forcing light atoms together to form a single heavier atom. chain reaction critical mass nuclear fission nuclear fusion plutonium The process that occurs when a thermonuclear or hydrogen bomb explodes and matter is converted into energy.

34. SmartEngine - SmartGuide ( FAMOUSWOMEN : Marie Curie ) antoine henri becquerel (18521908) nobel for the discovery of radioactivityin 1896, shared with Pierre Curie and Marie Curie. http://famouswomen.smartengine.com/shell/smartpage/Marie_Curie

SmartGuide Web Auctions FAMOUSWOMEN : Marie Curie Featured Web Pages Buy Books on Marie Curie at Amazon.com - http://www.amazon.com From hardback to paperback, Amazon.com has the book you need. Super low prices, reliable delivery and a huge selection. Free Super Saver Shipping. Categories (1-5 of 5) Kids_and_Teens: School_Time: Science: Scientists: Curie,_Marie Science: Chemistry: Nobel_Prize_in_Chemistry: Nobel_Laureates: Curie,_Marie World: Espa±ol: Ciencia_y_tecnolog­a: F­sica: Historia: Biograf­as: Curie,_Marie Kids_and_Teens: School_Time: Science: Scientists: Curie,_Pierre ... Science: Chemistry: Inorganic: People Web Pages Marie Curie Short biography and photograph. - http://curie.che.virginia.edu/scientist/curie.html Kids and Teens: School Time: Science: Scientists: Curie, Marie Marie Curie - Polish/French Physicist Brief biography. - http://www.lucidcafe.com/lucidcafe/library/95nov/curie.html Science: Chemistry: Nobel Prize in Chemistry: Nobel Laureates: Curie, Marie Marie Curie and The Science of Radioactivity Virtual exhibit celebrates the life of the woman who discovered radium. Includes numerous images and detailed in-depth biographical information. - http://www.aip.org/history/curie/

35. 'The Textbook Letter' For November-December 1999: 'Editor's File' and whose achievements are inseparable antoine henri becquerel (18521908 becquereland both Curies were honored for when they shared the nobel Prize in http://www.textbookleague.org/105eddi.htm

from The Textbook Letter , November-December 1999 Editor's File William J. Bennetta Pandering Well, look who's here: It's Madame Curie, all painted up in glorious, phony colors. This picture a colorized fake, made from a black-and-white photo that was taken about 100 years ago appears in Chemical Building Blocks, one of the fifteen books in the Prentice Hall Science Explorer series published by the Prentice Hall division of Pearson Education. Pearson Education sells the Science Explorer series for use in middle schools. Why has Prentice Hall printed this gewgaw, instead of using a faithful reproduction of the original photo? Apparently because the Science Explorer books have been developed for sale to teachers who like colorful pictures and who don't care about much else. This isn't surprising: Prentice Hall routinely preys on the dumbest educators in the land, and Prentice Hall's illustrators need not fear that such customers will care about history or about the integrity of historical records. Indeed, the illustrators need not fear that such customers will even recognize that the picture in Chemical Building Blocks is a fake.

36. Encyclopædia Britannica antoinehenri becquerel French physicist who discovered radioactivity through hisinvestigations of uranium and other substances. In 1903 he shared the nobel http://www.britannica.com/eb/article?eu=14239

37. EXplorations In Medicine from the nobel Prize to World War I. henri becquerel antoine henri becquerel (18521908 http://interzone.com/~cheung/SUM.dir/med95.html

visit radioativity page visit radioativity page 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. As a student in Holland, Roentgen was expelled from the Utrecht Technical School for a prank committed by another student. Even after receiving a doctorate, his lack of a diploma initially prevented him from obtaining a position at the University of Wurzburg. He even was accused of having stolen the discovery of X rays by those who failed to observe them. Nevertheless, Roentgen was a brilliant experimentalist who never sought honors or financial profit for his research. He rejected a title (i.e., von Roentgen) that would have provided entry into the German nobility, and donated the money he received from the Nobel Prize to his University. Roentgen did accept the honorary degree of Doctor of Medicine offered to him by the medical faculty of his own University of Wurzburg. However, he refused to take out any patents in order that the world could freely benefit from his work. At the time of his death, Roentgen was nearly bankrupt from the inflation that followed World War I. - Henri Becquerel Antoine Henri Becquerel (1852-1908) Henri Becquerel was born into a family of scientists. His grandfather had made important contributions in the field of electrochemistry while his father had investigated the phenomena of fluorescence and phosphorescence. Becquerel not only inherited their interest in science, he also inherited the minerals and compounds studied by his father.And so, upon learning how Wilhelm Roentgen discovered X rays from the fluorescence they produced, Becquerel had a ready source of fluorescent materials with which to pursue his own investigations of these mysterious rays. The material Becquerel chose to work with was potassium uranyl sulfate, K2UO2(S)4)2, which he exposed to sunlight and placed on photographic plates wrapped in black paper. When developed, the plates revealed an image of the uranium crystals. Becquerel concluded "that the phosphorescent substance in question emits radiation which penetrates paper opaque to light." Initially he believed that the sun's energy was being absorbed by the uranium which then emitted X rays. Further investigation, on the 26th and 27th of February, was delayed because the skies over Paris were overcast and the uranium-covered plates Becquerel intended to expose to the sun were returned to a drawer. On the first of March, he developed the photographic plates expecting only faint images to appear. To his surprise, the images were clear and strong. This meant that the uranium emitted radiation without an external source of energy such as the sun. Becquerel had discovered radioactivity, the spontaneous emission of radiation by a material. Later, Becquerel demonstrated that the radiation emitted by uranium shared certain characteristics with X rays but, unlike X rays, could be deflected by a magnetic field and therefore must consist of charged particles. For his discovery of radioactivity, Becquerel was awarded the 1903 Nobel Prize for physics. - Marie Curie ca. 1920. Inset: Pierre Curie (Marie's favorite picture of her husband). Pierre Curie (1859-1906) Marie Curie (1867-1934) By the time he met Marie Sklodowska, Pierre Curie had already established an impressive reputation. In 1880, he and his brother Jacques had discovered piezoelectricity whereby physical pressure applied to a crystal resulted in the creation of an electric potential. He also had made important investigations into the phenomenon of magnetism including the identification of a temperature, the curie point, above which a material's magnetic properties disappear. However, shortly after his marriage to Marie in 1895, Pierre subjugated his research to her interests. Together, they began investigating the phenomenon of radioactivity recently discovered in uranium ore. Although the phenomenon was discovered by Henri Becquerel, the term radioactivity was coined by Marie. After chemical extraction of uranium from the ore, Marie noted the residual material to be more "active" than the pure uranium. She concluded that the ore contained, in addition to uranium, new elements that were also radioactive. This led to their discoveries of the elements of polonium and radium, but it took four more years of processing tons of ore under oppressive conditions to isolate enough of each element to determine its chemical properties. For their work on radioactivity, the Curies were awarded the 1903 Nobel Prize in physics. Tragically, Pierre was killed three years later in an accident while crossing a street in a rainstorm. Pierre's teaching position at the Sorbonne was given to Marie. Never before had a woman taught there in its 650 year history! Her first lecture began with the very sentence her husband had used to finish his last. In his honor, the 1910 Radiology Congress chose the curie as the basic unit of radioactivity: the quantity of radon in equilibrium with one gram of radium (current definition: 1 Ci = 3.7x1010 dps). A year later, Marie was awarded the Nobel Prize in chemistry for her discoveries of radium and polonium, thus becoming the first person to receive two Nobel Prizes. For the remainder of her life she tirelessly investigated and promoted the use if radium as a treatment for cancer. Marie Curie died July 4, 1934, overtaken by pernicious anemia no doubt caused by years of overwork and radiation exposure. - Ernest Rutherford in his Laboratory at McGill University ca. 1903. Ernest Rutherford (1871-1937) Ernest Rutherford is considered the father of nuclear physics. Indeed, it could be said that Rutherford invented the very language to describe the theoretical concepts of the atom and the phenomenon of radioactivity. Particles named and characterized by him include the alpha particle, beta particle and proton. Even the neutron, discovered by James Chadwick, owes its name to Rutherford. The exponential equation used to calculate the decay of radioactive substances was first employed for that purpose by Rutherford and he was the first to elucidate the related concepts of the half-life and decay constant. With Frederick Soddy at McGill University, Rutherford showed that elements such as uranium and thorium became different elements (i.e., transmuted) through the process of radioactive decay. At the time, such an incredible idea was not to be mentioned in polite company: it belonged to the realm of alchemy, not science. For this work, Rutherford won the 1908 Nobel Prize in chemistry. In 1909, now at the University of Manchester, Rutherford was bombarding a thin gold foil with alpha particles when he noticed that although almost all of them went through the gold, one in eight thousand would "bounce" (i.e., scatter) back. The amazed Rutherford commented that it was "as if you fired a 15-inch naval shell at a piece of tissue paper and the shell came right back and hit you." From this simple observation, Rutherford concluded that the atom's mass must be concentrated in a small positively-charged nucleus while the electrons inhabit the farthest reaches of the atom. Although this planetary model of the atom has been greatly refined over the years, it remains as valid today as when it was originally formulated by Rutherford. In 1919, Rutherford returned to Cambridge to become director of the Cavendish laboratory where he had previously done his graduate work under J.J. Thomson. It was here that he made his final major achievement, the artificial alteration of nuclear and atomic structure. By bombarding nitrogen with alpha particles, Rutherford demonstrated the production of a different element, oxygen. "Playing with marbles" is what he called; the newspapers reported that Rutherford had "split the atom." After his death in 1937, Rutherford's remains were buried in Westminster Abbey near those of Sir Isaac Newton. -

38. Becquerel becquerel, (antoine)henri (szül. 1852. dec. 15. Párizs, Franciaország – megh. 1903-banPierre és Marie Curie-vel megosztva fizikai nobel-díjat kapott. http://www.mezgazd-koszeg.sulinet.hu/kemia/DATA/Tudosok/data/bh2/becquer.html

Becquerel, (Antoine-)Henri Marie Curie -vel megosztva fizikai Nobel-díjat kapott. Tanulóévek. A fizikai kutatások fô területei a XIX. században az elektromosság, a mágnesesség, az optikai jelenségek és az energia voltak. Néhány évig a fiatal Becquerel a síkban polarizált fény mágneses térben való elfordulását vizsgálta. Erre a jelenségre Michael Faraday hívta fel a figyelmet, és a kutatásban Becquerel apja is közremûködött. Ezután infravörös sugárzással foglalkozott, többek között megvizsgálta, hogyan befolyásolja az infravörös gerjesztés a különbözô foszforeszkáló kristályok színképét. Külön is megemlítendô, hogy apja munkájának kiterjesztéseként megvizsgálta néhány uránvegyület esetében az elnyelt fény és a kibocsátott foszforeszcencia viszonyát. 1896-ra Becquerel kiváló és köztiszteletben álló fizikus lett, 1889-tôl a Tudományos Akadémia tagja; de addigi kutatásainál fontosabb volt a foszforeszkáló anyagok terén, valamint az uránvegyületek világában szerzett ismerete és általános jártassága a laboratóriumi módszerekben, egyebek között a fényképezésben. Mindezek segítették hozzá a radioaktivitás felfedezéséhez. A sugárzás rendszeres vizsgálata.

39. Cronoloxía De Feitos Na Química Translate this page 1896. antoine-henri becquerel descobre a radioactividade. Jacobus henricus van't Hoffrecibe o primeiro premio nobel en Química polo descubrimento das leis da http://web.usc.es/~qimaneir/files/crono.htm

CRONOLOXÍA DOS FEITOS HISTÓRICOS MÁIS RELEVANTES DA QUÍMICA MODERNA A nivel galego A nivel mundial Henry Cavendish xera hidróxeno ("ar inflamable") ó tratar algúns metais con ácidos fortes. Joseph Priestley obtén osíxeno libre ó quentar HgO. Previamente Carl Wilhelm Scheele xa o obtivera en 1771-72, aínda que non publicaría os seus resultados ata 1777. Antoine Lavoisier Os experimentos de Antoine Lavoisier determinan o derrube da teoría do floxisto. O profesor Francisco Neira convence ó Claustro da USC da importancia e da necesidade do ensino das novas ciencias experimentais (física, química, botánica, etc.) para acadar unha mellor instrucción dos médicos. Antoine Lavoisier , despois de postular a lei de conservación da materia, publica o "Traité elémentaire de chimie", onde presenta a base da nomenclatura química moderna. John Dalton propón a lei da composición constante (ou das proporcións definidas) para as substancias químicas.

40. Sci-Philately - A Selective History Of Science On Stamps antoine henri becquerel (18521919) (Detail) was a French physicist whose researchled him to He shared a nobel prize for his discovery with Pierre and Marie http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps/modphys1.html

MODERN PHYSICS PART I In the words of physicist Philip Morrison, "twentieth-century physics began about five years ahead of the century itself." The discovery of X-rays by Wilhelm Conrad Roentgen and Henri Becquerel's investigations of phosphorescent salts that fogged photographic plates whether or not they had been exposed to light ushered in the era of modern physics. Becquerel did not immediately realize that a previously unknown type of energy caused his so-called uranium rays - what Marie and Pierre Curie would call "radioactivity." Roentgen and the Curies appear on stamps from many countries around the world, whereas Bequerel did not capture the popular imagination, nor the attention of other than French postal authorities who decide whom to commemorate. Wilhelm Conrad Roentgen (1845-1923) worked with cathode ray tubes and chemoluminescence. He discovered an invisible yet highly penetrating radiation which he called X-rays, and received the first Nobel prize in physics as a result. "Modern physics" had its beginning here. The year 1995, the centenary of his discovery, brought forth a spate of stamps from diverse countries, many of which show the striking skeletal image of Roentgen's wife's hand, with ring. Forever associated with radiology, and the medical applications of X-rays, Roentgen and his cathode ray tube have appeared on earlier issues as well. Antoine Henri Becquerel (1852-1919) ( Detail ) was a French physicist whose research led him to the study of fluorescence in minerals. He discovered radioactivity when studying uranium compounds, which, unlike other fluorescent substances, fogged photographic plates even without having been exposed to strong light. He shared a Nobel prize for his discovery with Pierre and Marie Curie in 1903.

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