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Q.40 A nucleus of mass number A originally atrest emits o-particle with speed v. The recoilspeed of daughter nucleus is4V4V(B) A+4(D) A+4(A)A-4(C) A-4

Answer»

Mass of nucleus is Ainitial velocity=0velocity of alpha particle is vlet the recoil velocity be vc.Initial momentum of system is 0.Final momentum, P= (A-4)*vc-4v{A-4 as the alpha particle escapes, so we need to subtract its mass}therefore, (A-4)*vc-4v=0So, vc=4v/(A-4)so answer is (A)



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