Q.

An α-particle of 7 MeV energy strikes with a nucleus of uranium at stationary at an scattering angle of 180o. The nearest distance upto which α-particle reaches the nucleus will be of the order of

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1 Å

10-10 cm

10-12 cm

10-15 cm

answer is C.

(Detailed Solution Below)

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Detailed Solution

At closest distance of approach Kinetic energy = Potential energy ⇒7×106×1.6×10−19=14πε0×(ze)(2e)rFor uranium z= 92, so r=5.3×10−12cm

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