https://padlet.com/nelsharka0001/hsbnv3b731i0 en-us 2016-03-31 16:31:11 UTC 2024-01-24 18:51:22 UTC hello@padlet.com nelsharka0001 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103488216 2016-03-31 16:41:05 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103488216 nelsharka0001 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103488897 He was December 1856 – 30 August 1940) was an English physicist. He was elected as a fellow of the Royal Society of London and appointed to the Cavendish Professorship of Experimental Physics at the Cambridge University's Cavendish Laboratory in 1884. He created the atomic theory]]> 2016-03-31 16:43:59 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103488897 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489020 After the end of the war, Bohr returned to Europe and continued to call for peaceful applications of atomic energy. In his "Open Letter to the United Nations," dated June 9, 1950, Bohr envisioned an "open world" mode of existence between countries that abandoned isolationism for true cultural exchange.

He helped to establish CERN, a Europe-based particle physics research facility, in 1954 and put together the Atoms for Peace Conference of 1955. In 1957, Bohr received the Atoms for Peace Award for his trailblazing theories and efforts to use atomic energy responsibly.

Bohr was a prolific writer with more than 100 publications to his name. After having a stroke, he died on November 18, 1962, in Copenhagen. Bohr’s son Aage shared with two others the 1975 Nobel Prize in Physics for his research on motion in atomic nuclei.

]]> 2016-03-31 16:44:24 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489020 nelsharka0001 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489640 Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844). Although two centuries old, Dalton's atomic theory remains valid in modern chemical thought.]]> 2016-03-31 16:46:38 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489640 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489752 Democritus was born in Abdera, Thrace[4] around 460 BC, although, some thought it was 490 BC. His exact contributions are difficult to disentangle from those of his mentor Leucippus, as they are often mentioned together in texts. Their speculation on atoms, taken from Leucippus, bears a passing and partial resemblance to the nineteenth-century understanding of atomic structure that has led some to regard Democritus as more of a scientist than other Greek philosophers; however, their ideas rested on very different bases.[5] Largely ignored in ancient Athens, Democritus is said to have been disliked so much by Plato that the latter wished all of his books burned.[6] He was nevertheless well known to his fellow northern-born philosopher Aristotle. Many consider Democritus to be the "father of modern science".[7] None of his writings have survived, from his vast body of work only are known fragments.]]> 2016-03-31 16:47:02 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489752 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489995 30 August 1871 – 19 October 1937
(1)Rutherford identified a simpler and more commercially viable means of detecting radio waves than had been previously established by German physicist Heinrich Hertz.
(2)discovered the concept of radioactive half-life, proved that radioactivity involved the nuclear transmutation of one chemical element to another, and also differentiated and named alpha and beta radiation.
(3)Rutherford became Director of the Cavendish Laboratory at the University of Cambridge in 1919. Under his leadership the neutron was discovered by James Chadwick in 1932

]]> 2016-03-31 16:48:10 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103489995 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103490269 2016-03-31 16:49:26 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103490269 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103490861 In 1930, when Herbert Becker and Walter Bothe sent alfa particles (helium nuclei) against beryllium, strong penetrating radiation was emitted, there was a hypothesis that this could be electromagnetic radiation of high energy. However, in 1932 James Chadwick could show that in the reaction, a neutral particle with a mass about that of a proton, was emitted. Ernest Rutherford had earlier proposed that such a neutral particle might exist in nuclei. The particle was discovered and was named neutron.


]]> 2016-03-31 16:51:55 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103490861 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103491106 It is generally accepted that Lavoisier's great accomplishments in chemistry largely stem from his changing the science from a qualitative to a quantitative one. Lavoisier is most noted for his discovery of the role oxygen plays in combustion. He recognized and named oxygen (1778) and hydrogen (1783) and opposed the phlogiston theory. Lavoisier helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He predicted the existence of silicon (1787)[5] and was also the first to establish that sulfur was an element (1777) rather than a compound.[6] He discovered that, although matter may change its form or shape, its mass always remains the same.


]]> 2016-03-31 16:52:49 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103491106 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103491650 2016-03-31 16:54:57 UTC https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103491650 https://padlet.com/nelsharka0001/hsbnv3b731i0/wish/103491983 12 August 1887 – 4 January 1961
(1)a Nobel Prize-winning Austrian physicist who developed a number of fundamental results in the field of quantum theory, which formed the basis of wave mechanics
(2)He provided a mode of thought to scientists that would become accepted and incorporated into thousands of papers, thus becoming an important cornerstone of quantum theory. 
(3)He also wrote on philosophy and theoretical biology. He is also known for his "Schrödinger's cat" thought-experiment.

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