Roosevelt receives the Einstein–Szilárd letter and authorizes the creation of the Advisory Committee on Uranium.
1939 – September 1 – World War II begins after the invasion and subsequent partition of Poland between Nazi Germany and the Soviet Union. 1939 – April – Nazi Germany begins the German nuclear energy project. Bohr and John Archibald Wheeler determine later that year through chain-reaction experiments at Princeton University that uranium-235 could produce a nuclear explosion. Frisch goes to Copenhagen to share the discovery with his Niels Bohr, who in turn reports the discovery to his American colleagues. 
1939 – January – Otto Robert Frisch experimentally confirms Otto Hahn and Fritz Strassman's discovery of nuclear fission.This is correctly interpreted by Lise Meitner and her nephew Otto Robert Frisch as nuclear fission. 1938 – December – The German chemists Otto Hahn and Fritz Strassman detect barium after bombarding uranium with neutrons.1938 – Fermi is awarded the Nobel Prize in Physics for his achievements, and flees from Fascist Italy to the United States due to the racial laws ratified under pressure from Nazi Germany.Although he is unaware at the time, he creates the first synthetic elements, the transuranium elements.
1934 – Enrico Fermi conducts experiments in which he exposes uranium and thorium to neutrons to create distinct new substances.He invented the idea of an atomic bomb in 1933 while crossing a London street in Russell Square.
1933 – Leó Szilárd realizes the concept of the nuclear chain reaction, although no such reaction was known at the time. 1932 – James Chadwick discovers the neutron, leading to experiments in which elements are bombarded with the new particle. 1924 – Writing for The Pall Mall Gazette, Winston Churchill speculates "Might a bomb no bigger than an orange be found to possess a secret power to destroy a whole block of buildings – nay to concentrate the force of a thousand tons of cordite and blast a township at a stroke?". 1920 – Rutherford postulates the existence of a neutral particle in the atomic nucleus at a Bakerian Lecture in London. Inspired by the research of Rutherford, Sir William Ramsay, and Frederick Soddy, the novel predicts the development of nuclear weapons, and features a uranium-based hand grenade that does not extinguish once detonated. Wells writes The World Set Free, a science fiction novel postulating a world war in 1956 pitting the United Kingdom and France against Germany and Austria-Hungary. Thomson discovers isotopes through experiments with neon. 1911 – Ernest Rutherford discovers that the majority of the energy in an atom is contained in the nucleus through experiments at the University of Manchester. 1905 – Albert Einstein develops the theory of relativity equating energy and matter. 1904 – Frederick Soddy first proposes a bomb powered by nuclear fission to the Royal Engineers. 1900 – Max Planck theorizes that matter can only absorb energy in fixed quanta. Thomson observes the photoelectric effect. 1896 – Henri Becquerel discovers that uranium emits radiation at the National Museum of Natural History in Paris. 1895 – Wilhelm Konrad Röntgen discovers X-rays at the University of Würzburg.
0 kommentar(er)
