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In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to deflect at angles > 50º. If one mole of α-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 500.
% of α-particles deflected more than
50∘ =1% of α-particles.
% of α-particles deflected less than
50∘ =100 – 1 = 99%
Number of α-particles bombarded = 1 mole =
Number of particles that deflected at an angle less than 50∘,
=(99/100) × 6.022 × 1023
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