Question

a neutron moving with a certain kinetic energy collide head on with an atom.of mass number A.Find the fraction of kinetic energy retained by it.
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Answer 1

Answer:

3rd  option

Explanation

https://www.toppr.com/ask/question/a-neutron-moving-with-a-certain-kinetic-energy-collides-head-on-with-an-atom-of/

can check the above link for explanation.

Answer 2

Answer:

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