The observations of Geiger-Marsden experiment are I. many of \( \al...

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The observations of Geiger-Marsden experiment are
I. many of \( \alpha \) particles pass straight through the gold foil.
II. only about \( 0.14 \% \) of \( \alpha \)-particles scatter by more than \( 1^{\circ} \)
III. about 1 in 8000 of \( \alpha \)-particles is deflected more than \( 90^{\circ} \).
IV. very few particles are reflected back.
(a) I, II and IV
(b) I, II and III
(c) II, III and IV
(d) I, II III and IV
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