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  • J.J. Thomson was born on December 18, 1856 in Cheetham Hill, England. 
  • In 1894, Thomson began studying CATHODE RAYS, which are glowing beams of light that follow an electrical discharge in a high-vacuum tube.
  • He was able to measure the ANGLE at which they were deflected and calculate the RATIO of the electrical charge to the mass of the particles.
  •  This discovery supported the existing theory that the atom was the smallest fundamental unit.
  • He studied positively charged ions. Leading to one of his other famous discoveries in 1912, when he made a stream of ionized neon through a magnetic and an electric field which used deflection techniques to measure the charge to mass ratio.
  • J.J. married one of his students in 1890 and had two kids. He died in Cambridge on August 30, 1940
  • Mr. Thomson, i'm confused can I stay after class...? 
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