Johannes (Hans) Wilhelm Geiger (September 30, 1882 – September 24, 1945) was a German physicist. He is perhaps best-known as the co-inventor of the Geiger counter, and for the Geiger-Marsden experiment which discovered the atomic nucleus. is the 273rd day of the year (274th in leap years) in the Gregorian calendar. ... Year 1882 (MDCCCLXXXII) was a common year starting on Sunday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Friday of the 12-day slower Julian calendar). ... is the 267th day of the year (268th in leap years) in the Gregorian calendar. ... Year 1945 (MCMXLV) was a common year starting on Monday (link will display the full calendar). ... Not to be confused with physician, a person who practices medicine. ... This article or section does not cite any references or sources. ... Top: Expected results: alpha particles passing through the plum pudding model of the atom undisturbed. ... The nucleus of an atom is the very small dense region, of positive charge, in its centre consisting of nucleons (protons and neutrons). ...

Geiger was born at Neustadt-an-der-Haardt, Germany. He was one of five children born to the indologist Wilhelm Ludwig Geiger, who was professor at the University of Erlangen. position in Rhineland-Palatinate Neustadt an der Weinstrasse (formerly known as Neustadt an der Haardt) is a city in the Rhineland-Palatinate state in southwestern Germany. ... The castle in the center of Erlangen, known to many simply as the Schloss, is home to a large part of the universitys administration Friedrich Alexander University of Erlangen Nuremberg (FAU), founded in 1742, is Bavarias second largest state university with eleven faculties and 265 chairs. ...

In 1902 Geiger started studying physics and mathematics in University of Erlangen and was awarded a doctorate in 1906. In 1907 he began work with Ernest Rutherford at the University of Manchester. Together they created the Geiger counter. In 1911 Geiger and John Mitchell Nuttall discovered the Geiger-Nuttall law (or rule) and performed experiments that led to Rutherford's atomic model. In 1928 Geiger and his student Walther Müller created an improved version of the Geiger counter, the Geiger-Müller counter. Geiger also worked with James Chadwick. This is a discussion of a present category of science. ... Euclid, Greek mathematician, 3rd century BC, as imagined by by Raphael in this detail from The School of Athens. ... Ernest Rutherford, 1st Baron Rutherford of Nelson OM PC FRS (30 August 1871 - 19 October 1937), widely referred to as Lord Rutherford, was a nuclear physicist who became known as the father of nuclear physics. ... The University of Manchester is a university located in Manchester, England. ... John Mitchell Nuttall, (July 21, 1890 – January 28, 1958), was an English physicist who was born in Todmorden. ... In nuclear physics, the Geiger-Nuttall law (or Geiger-Nuttall rule) relates the decay constant of a radioactive isotope with the energy of the alpha particles emitted. ... A stylised representation of the Rutherford model of a lithium atom The Rutherford model of the atom was devised by Ernest Rutherford. ... Walther Müller was a German physicist, most well known for his improvement of Hans Geigers counter for ionizing radiation, now known as the Geiger-Mueller tube. ... A Geiger-Müller tube (or GM tube) is the sensing element of a Geiger counter instrument that can detect a single particle of ionizing radiation, and typically produce an audible click for each. ... Sir James Chadwick, CH (20 October 1891 – 24 July 1974) was an English physicist and Nobel laureate who is best known for discovering the neutron. ...

In 1912 he became leader of the Physical-Technical Reichsanstalt in Berlin, 1925 professor in Kiel, 1929 in Tübingen, and from 1936 in Berlin. This article is about the capital of Germany. ... , For the city in the United States, see Kiel, Wisconsin. ... Tübingen, Neckar front Tübingen, a traditional university town of Baden-Württemberg, Germany, is situated 20 miles southwest of Stuttgart, on a ridge between the River Neckar and the Ammer. ...

Geiger died in Potsdam a few months after the war ended. Potsdam is the capital city of the federal state of Brandenburg in Germany. ...

External links

• Brief biographical material
• Annotated bibliography for Hans Geiger from the Alsos Digital Library for Nuclear Issues