atomicstructscientists.pdf - Scientists of Atomic Structure Wilhelm Rntgen(1845-1923 German physicist who discovered X-rays in 1895 after observing that

atomicstructscientists.pdf - Scientists of Atomic Structure...

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Scientists of Atomic Structure Wilhelm Röntgen (1845-1923) German physicist who discovered X-rays in 1895 after observing that a sheet of paper coated with barium platinocyanide glowed when a cathode ray tube (CRT) was turned on. (A CRT is a high-vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used chiefly in televisions and computer terminals.) X-rays are electromagnetic radiation of high energy that is able to pass through many materials opaque to visible light. He received the first Nobel Prize in physics in 1901. Henri Becquerel (1852-1908) French physicist who, in 1896, while investigating fluorescence in uranium salts, accidentally 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. The full impact of Becquerel's discovery was not appreciated, however, until the work of Marie and Pierre Curie, with whom he shared the 1903 Nobel Prize in physics.
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