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Question: Answered & Verified by Expert

A radioactive nucleus at rest having mass number A , emits an alpha-particle with speed v. The recoil speed of the daughter nucleus is

PhysicsCenter of Mass Momentum and CollisionJEE Main
Options:
  • A 2v(A-4)
  • B 2v(A+4)
  • C 4v(A-4)
  • D 4v(A+4)
Solution:
1286 Upvotes Verified Answer
The correct answer is: 4v(A-4)
As per the law of conservation of momentum,
0=4v-A-4vr
∴ Recoil speed vr=4v(A-4)

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