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Question: Answered & Verified by Expert
A neutron is moving with velocity u. It collides head-on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron is E, then how much kinetic energy will be retained by the neutron after reflection?
PhysicsNuclear PhysicsNEET
Options:
  • A AA+12E
  • B AA+12 E
  • C A-1A+12E
  • D A -1A+12 E
Solution:
2660 Upvotes Verified Answer
The correct answer is: A-1A+12E
The fraction of total retained by nucleus



( Δk k ) retained = ( m 2 m 1 m 1 + m 2 ) 2 = ( A1 A+1 ) 2

Kinetic energy retained by neutron after collision is A-1A+12E.

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