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Ernest Rutherford in 1909 conducted what is now a famous experiment where he bombarded gold foil with alpha particles (Helium nuclei). A source which undergoes for alpha decay is placed in a lead box with a small window in it. Any of the alpha particles which hit the inside of the box are simply stopped by the box. Only those particles which pass through the opening are allowed to escape, and they follow a straight line along with gold foil. Observations
Most of the alpha particles pass straight through the gold foil.
Conclusions
Rutherford's Experiment
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