4 Important Experiments

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Last updated 11:04 PM on 9/8/26

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Cathode Ray

J.J. Thompson - discovered electron and its charge to mass (e/m) ratio

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Oil Drop Experiment

Millikan - discovered exact charge of electron

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Gold foil experiment

Rutherford - discovered the nucleus and existence of proton.

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Radiation / Radioactivity

Chadwick - found neutron and discovered aspects of isotopes