Extended Essay - electron history

Main

Schuster - mass/charge ratio in cathode rays

Approx. 1879 - Approx. 1880

through measuring the magnetic deflection of cathode rays

Herzt - Cathode rays must be waves

Approx. 1891 - Approx. 1892

can penetrate thin foils of metal, which he takes to support the wave hypothesis

Thomson - velocity of cathode rays

Approx. 1893 - Approx. 1894

discovered that the velocity of cathode rays where significantly lower than the speed of light

Perrin - cathode rays deposite negative charge

Approx. 1894 - Approx. 1895

cathode rays deposite negative charge where they impact - refuting claim that cathode rays are waves

Lorentz - mass/charge ratio of electrons in atoms

Approx. 1895 - Approx. 1896

Lorentz uses Zeemans observations of the behaviour of light in a magnetic field to calculate the mass/charge ratio of the electron in an atom

Thomson - discovers the electron

Approx. 1896 - Approx. 1897

discovers the electron and the mass to charge ratio by deflecting them by electric and magnetic fields

Thomson - measures the charge of the electron

Approx. 1898 - Approx. 1899

unites the differet theories of a negative corpuscle

Millikan - quanitifies the electron charge

Approx. 1912 - Approx. 1913

proves that the electron has a quantifiable charge through the "oil-drop" experiment