> wiki   Explore:images videos games  

J. J. Thomson

KidzSearch Safe Wikipedia for Kids.
Jump to: navigation, search
J. J. Thomson

Sir Joseph John Thomson (1856-1940). Portrait by Arthur Hacker.
Born 18 December 1856
Cheetham Hill, Manchester, UK
Died 30 August 1940(1940-08-30) (aged 83)
Cambridge, UK
Nationality British
Fields Physics
Institutions Cambridge University
Alma mater University of Manchester
University of Cambridge
Academic advisors John Strutt (Rayleigh)
Edward John Routh
Notable students Charles Glover Barkla
Charles T. R. Wilson
Ernest Rutherford
Francis William Aston
John Townsend
J. Robert Oppenheimer
Owen Richardson
William Henry Bragg
H. Stanley Allen
John Zeleny
Daniel Frost Comstock
Max Born
T. H. Laby
Paul Langevin
Balthasar van der Pol
Geoffrey Ingram Taylor
Known for Plum pudding model
Discovery of electron
Discovery of isotopes
Mass spectrometer invention
First m/e measurement
Proposed first waveguide
Thomson scattering
Thomson problem
Coining term 'delta ray'
Coining term 'epsilon radiation'
Thomson (unit)
Notable awards Nobel Prize for Physics (1906)
Thomson is the father of Nobel laureate George Paget Thomson.

Sir Joseph John "J.J." Thomson, OM, FRS (18 December 1856 – 30 August 1940) was a British physicist and Nobel laureate. He discovered the electron and isotopes, and invented the mass spectrometer. He was awarded the Nobel Prize in Physics in 1906 for his discovery of the electron and his work on the conduction of electricity in gases. John Joseph Thomson in 1893 said: "There is no other branch of physics which affords us so promising an opportunity of penetrating the secret of electricity."

In 1897, Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, later called the electron as the first subatomic particle to be found. Thomson also found the first evidence for isotopes of a stable (non-radioactive) element in 1913, while studying anode rays (positive ions).

In atomic theory he hypothesized that atoms were spheres of evenly spread positive charge, where an individual negatively charged electron resided. He later concluded there was more than one negatively charged particle in an atom.

This person won a Nobel Prize