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The gold foil experiment of Geiger and Marsden (under Rutherford, 1911) used what particles to bombard the foil?
AGamma rays
BNeutrons
CBeta particles
DAlpha particles
Answer & Solution
Correct answer: D. Alpha particles
Geiger and Marsden aimed alpha particles (helium-4 nuclei, He²⁺) at a thin gold foil. Most passed through, a few were deflected at large angles, and a very small fraction bounced back almost directly. This pattern was inconsistent with Thomson's plum-pudding model.
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