Question : A moving neutron collides with a stationary α particle. The fraction of the kinetic energy lost by the neutron is:
Option 1: 1/4
Option 2: 1/16
Option 3: 9/25
Option 4: 16/25
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Correct Answer: 16/25
Solution : The correct answer is 16/25.
In a collision between a neutron, and a stationary α-particle, the system conserves linear momentum. Due to the relatively large mass of the α-particle, it gains most of the kinetic energy. The fraction of kinetic energy lost by the neutron is the ratio of the kinetic energy lost by the neutron to its initial kinetic energy, which is 16/25.
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