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A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A',B', and C' of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

(a) B' will be minimum and in maximum
(b) A' will be maximum and in minimum
(c) A' will be minimum and in maximum
(d) C' will be minimum and in maximum

(b) Because atom is hollow and whole mass of atom is concentrated in a small centre called nucleus.

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