Word Count : 250

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Geiger and Marsden’s α-particle scattering experiment, carried out under Rutherford’s supervision, investigated how α-particles interact with matter and revealed the internal structure of the atom. A thin gold foil was bombarded with fast-moving α-particles emitted from a radioactive source such as radium. These particles were directed through a lead collimator to ensure a narrow beam. A zinc sulphide fluorescent screen surrounded the ____ _______ _______ ____ _____ ____ ________ ______ _______ _____.
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