The Discovery of the Electron BY THONNY KOON. J.J. Thomsom  Third Cavendish Professor of Experimental Physics in 1884.  Studied Cathode Rays  At the.

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Presentation transcript:

The Discovery of the Electron BY THONNY KOON

J.J. Thomsom  Third Cavendish Professor of Experimental Physics in  Studied Cathode Rays  At the time many people thought the rays were an ethereal disturbance like light  Thomson believed the rays were made of particles.

 Uses two metal plates (one positively charged and one negatively charged) to deflect cathode rays.  Accomplishes this by creating a vacuum in the tube.  Since the rays moved towards the positively charged plate, it was determined that the particles had a negative charge.

 J.J. ran a current through a coil of wire to produce a magnetic field.  J.J positioned the coils so that the magnetic field deflects the rays in the opposite direction to the deflection produced by the electric field from the metal plates.  The fields were adjusted so that the rays were deflected evenly and thus the forces were balanced

Results  Found a charged particle that had a charge two thousand times greater than a hydrogen ion.  These particles were also two thousand times lighter than hydrogen and therefor can pass between atoms in a solid.  J.J called these particles corpuscles.  G. Johnstone Stoney coined the term electron

Works Cited  outreach.phy.cam.ac.uk/camphy/electron/elect ron5_1.htm outreach.phy.cam.ac.uk/camphy/electron/elect ron5_1.htm 