Otto Robert Frisch (1 October 1904–22 September 1979), Austrian-British physicist. With his collaborator Rudolf Peierls he designed the first theoretical mechanism for the detonation of an atomic bomb in 1930. October 1 is the 274th day of the year (275th in leap years) in the Gregorian Calendar. ... 1904 (MCMIV) was a leap year starting on a Friday (link will take you to calendar). ... September 22 is the 265th day of the year in the Gregorian calendar (266th in leap years). ... This page refers to the year 1979. ... A physicist is a scientist trained in physics. ... Sir Rudolf Ernst Peierls, (June 5, 1907, Berlin – September 19, 1995, Oxford), was a German-born British physicist. ... The mushroom cloud of the atomic bombing of Nagasaki, Japan, 1945, rose some 18 km (11 mi) above the epicenter. ...

Frisch was Jewish, born in Vienna in 1904 the son of a painter and a concert pianist. He himself was talented at both but also had inherited his aunt Lise Meitner's love of physics and commenced a period of study at the University of Vienna, graduating in 1926 with some work on the effect of the newly discovered electron on salts. After some years working in relatively obscure laboratories in Germany, Frisch obtained a position in Hamburg under the Nobel Prize winning scientist Otto Stern. Here he produced novel work on the diffraction of atoms (using crystal surfaces) and also proved that the magnetic moment of the proton was much larger than had been previously supposed. The word Jew ( Hebrew: יהודי) is used in a wide number of ways, but generally refers to a follower of the Jewish faith, a child of a Jewish mother, or someone of Jewish descent with a connection to Jewish culture or ethnicity and often a combination of these attributes. ... 1904 (MCMIV) was a leap year starting on a Friday (link will take you to calendar). ... Lise Meitner ca. ... 1926 (MCMXXVI) was a common year starting on Friday (link will take you to calendar). ... Properties The electron is a fundamental subatomic particle that carries a negative electric charge. ... Alster Lake at dusk Hamburg is the second largest city in Germany and with Hamburg Harbour, its principal port. ... Sir Edward Appletons medal Photographs of Nobel Prize Medals. ... Otto Stern Otto Stern (February 17, 1888 – August 17, 1969) was an German physicist and Nobel laureate. ... Properties In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ...

The accession of Adolf Hitler to the chancellorship of Germany in 1933 made Frisch make the decision to move to London where he joined the staff at Birkbeck College and worked with the physicist Patrick Maynard Stuart Blackett on cloud chamber technology and artificial radioactivity. He followed this with a five year stint in Copenhagen with Niels Bohr where he increasingly specialised in nuclear physics particularly neutron physics. (help· info) (April 20, 1889 – April 30, 1945) was Chancellor of Germany from 1933 and Führer (Leader) of Germany from 1934 until his death. ... 1933 (MCMXXXIII) was a common year starting on Sunday (link will take you to calendar). ... For other uses, see London (disambiguation) and Defining London (below). ... Birkbeck Birkbeck (sometimes still called Birkbeck College) is a College of the University of London. ... Patrick Maynard Stuart Blackett, Baron Blackett (November 18, 1897—July 13, 1974) was a British experimental physicist known for his work on cloud chambers, cosmic rays, and paleomagnetism. ... The cloud chamber, also known as the Wilson chamber, is used for detecting particles of ionizing radiation. ... Radioactivity may mean: Look up radioactivity in Wiktionary, the free dictionary. ... Copenhagen (Danish: København) is the capital of Denmark, and the name of the municipality (Danish, kommune) in which it resides. ... Niels Bohr Niels (Henrik David) Bohr (October 7, 1885 – November 18, 1962) was a Danish physicist who made essential contributions to understanding atomic structure and quantum mechanics. ... Nuclear physics is the branch of physics concerned with the nucleus of the atom. ...

In 1938 he visited his aunt Lise Meitner in Stockholm. While there she received the news that Otto Hahn and Fritz Strassmann in Berlin had discovered that the collision of a neutron with a uranium nucleus produced the element barium as one of its byproducts. Hahn could not explain the result. Frisch and Meitner hypothesized that the uranium nucleus had split in two, explained the process (in terms of excessive electrical charge), estimated the energy released, coined the term fission to describe it, and theorized the potential for a chain reaction. Political restraints of the Nazi era forced the team to publish separately. Hahn's paper described the experiment and asserted that the atom had split. Meitner's and Frisch's paper explained the physics behind the phenomenon. Frisch went back to Copenhagen where he was quickly able to isolate the fragments produced by fission reactions. 1938 (MCMXXXVIII) was a common year starting on Saturday (link will take you to calendar). ... Lise Meitner ca. ... The Old town in Stockholm from the air (help· info) is the capital of Sweden, located on the east coast at the entrance of lake Mälaren. ... Otto Hahn (March 8, 1879 – July 28, 1968) was a German chemist. ... Fritz Strassman (February 22, 1902 - April 22, 1980) was a German physical chemist who, along with Otto Hahn, discovered the nuclear fission of uranium in 1938. ... (help· info) is the capital city and a state of Germany. ... Properties In physics, the neutron is a subatomic particle with no net electric charge and a mass of 939. ... General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Atomic mass 238. ... General Name, Symbol, Number barium, Ba, 56 Chemical series alkaline earth metals Group, Period, Block 2, 6, s Appearance silvery white Atomic mass 137. ... An induced nuclear fission event. ...

In the Summer of 1939 Frisch left Denmark for what he anticipated would be a short trip to Birmingham. But the outbreak of World War II precluded his return. With war on his mind and working with the physicist Rudolf Peierls the two produced the Frisch-Peierls memorandum which was the first document to set out a process by which an atomic explosion could be generated; using separated Uranium-235 which would require a fairly small critical mass and could be made to achieve criticality using conventional explosives and create an immensely powerful detonation. The memorandum went on to predict the effects of such an explosion - from the initial blast to the resulting fallout. 1939 (MCMXXXIX) was a common year starting on Sunday (link will take you to calendar). ... The city from above Centenary Square. ... Combatants Allies: Poland, British Commonwealth, France/Free France, Soviet Union, United States, China, and others. ... Sir Rudolf Ernst Peierls, (June 5, 1907, Berlin – September 19, 1995, Oxford), was a German-born British physicist. ... The Frisch-Peierls memorandum was written by Otto Frisch and Rudolf Peierls while they were both working at Birmingham University, England. ... A sphere of plutonium surrounded by neutron-reflecting blocks of tungsten carbide. ... Map of hypothetical fallout dispersal after a large-scale nuclear attack against the United States. ...

This memorandum was the basis of British work on building an atomic device (the Tube Alloys project) and also that of the Manhattan Project on which Frisch worked as part of the British delegation. He went to America in 1943 having been hurriedly made a British citizen. In 1946 he returned to England to take up the post of head of the nuclear physics division of the Atomic Energy Research Establishment at Harwell, though he also spent much of the next thirty years teaching at Cambridge where he was Jacksonian Professor of Natural Philosophy and a fellow of Trinity College. // Tube Alloys was the code-name for the British nuclear weapon programme during World War II, when the very possibility of nuclear weapons was kept at such a high level of secrecy that it had to be referred to by code even in the highest circles of government. ... The Manhattan Project resulted in the development of the first nuclear weapons, and the first-ever nuclear detonation at the Trinity test of July 16, 1945. ... 1943 (MCMXLIII) is a common year starting on Friday. ... 1946 (MCMXLVI) was a common year starting on Tuesday. ... The Atomic Energy Research Establishment near Harwell, Oxfordshire was the main centre for atomic energy research and development in the United Kingdom from the 1940s to the 1990s. ... Map of the Cambridgeshire area (1904) The city of Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. ... Full name The College of the Holy and Undivided Trinity Motto Virtus vera nobilitas Virtue is true Nobility Named after The Holy Trinity Previous names Kings Hall and Michaelhouse (until merged in 1546) Established 1546 Sister College(s) Christ Church Master The Lord Rees of Ludlow Location Trinity Street...

He retired from the chair in 1972 to concentrate on his books and business interests. He died in 1979. 1972 (MCMLXXII) was a leap year starting on Saturday (the link is to a full 1972 calendar). ... This page refers to the year 1979. ...