T homson 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 ID: 278289
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Slide1
J.J. Thomson
BY: Noah Rushing, Kayla Zajac, Wade Scott, Kate Schlechtweg Slide2
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 28Slide3
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 universalSlide4
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 elementSlide5
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.Slide6
Vacuum cathode ray tubeSlide7
Isotopes Slide8
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).Slide9
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.