In the Rutherford scattering experiment, the number of alpha particles scattered at an angle \( ...

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In the Rutherford scattering experiment, the number of alpha particles scattered at an angle \( \theta=60^{\circ} \) is 36 per minute. The number of alpha particles per minute scattered at angles \( \theta=90^{\circ} \) is (Assume all other conditions to be identical)
(a) 144
(b) 9
(c) 36
(d) 4
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