BY: Noah Rushing, Kayla Zajac, Wade Scott, Kate Schlechtweg

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Presentation transcript:

BY: Noah Rushing, Kayla Zajac, Wade Scott, Kate Schlechtweg J.J. Thomson BY: Noah Rushing, Kayla Zajac, Wade Scott, Kate Schlechtweg

Background Full name Joseph John Thomson Born on December 18, 1856 in Cheetham hill, Manchester, England Sent to Owens College at the age of 14 for 6 years 1876 received small scholarship at Trinity College at Cambridge for mathematics After graduation work in the Cavendish laboratory for Lord Rayleigh Quickly earned membership in royal society and was the caven dish Professor of physics at the age of 28

Thomson`s research In 1894 Thomson started studying cathode rays Cathode rays are glowing beams of light that follow an electric discharge This subject was a highly popular research topic as with other physicists developed better equipment and methods than previously used By passing rays through the vacuum and measuring the angle at which the rays where deflected and get the ratio of the electrical charge to the mass of the particles He then concluded that the particles that made up the gases were universal

Discovery`s Determined that all matter is mad up of particles smaller than atoms Originally called corpuscles renamed electrons 1906 studied positively charged rays/ions Led to one of his other famous discoveries in 1912, when he channeled a stream of ionized neon through a magnetic and an electric field and used deflection to measure the charge to mass ratio he discovered that neon was composed of two different kinds of atoms proved the existence of isotopes in a stable element

Cathode ray tube The cathode ray tube (CRT) consists of an electron gun, deflecting apparatus, and luminescent screen. The electron gun produces a beam of high-speed electrons focused to a small spot on the screen beam is deflected horizontally The source of electrons is a thermionic cathode which essentially boils electrons off the cathode. The electron beam is accelerated by an accelerating voltage which produces a constant forward velocity that stays constant through and after the deflection plates, toward the anode.

Vacuum cathode ray tube

Isotopes

Honnors the Nobel Prize in physics in 1906 and a knighthood in 1908. also had the great pleasure of seeing several of his close associates receive their own Nobel prizes, Rutherford (chemistry, 1908) and Aston (chemistry, 1922).

Resources Retrieved from http://www.biography.com/#!/people/jj-thomson-40039 Cathode Ray Experiment by J. J. Thomson. (n.d.). Retrieved from https://explorable.com/cathode-ray-experiment J. J. Thomson. (n.d.). Retrieved from http://www.nndb.com/people/479/000099182/ Joseph John Thomson | Chemical Heritage Foundation. (n.d.). Retrieved from http://www.chemheritage.org/discover/online- resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx Rinehart., Holt., & Winston. (2006). Modern chemistry. Austin, TX: Holt, Rinehart and Winston.