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J.J. J.J.

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J.J. - PPT Presentation

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

thomson cathode ray rays cathode thomson rays ray retrieved electrons chemistry www http tube electron beam particles produces resources

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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.

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