A neutron having KE SeV is incident on a hydrogen atom in its ground state- The collision-A- May be partially elasticB- Information is insufficientC- Must be elasticD- Must be completely inelastic

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Standard XII

Physics

Beta Decay

A neutron hav...

Question

A neutron having KE 5eV is incident on a hydrogen atom in its ground state. The collision-

Must be elastic

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Must be completely inelastic

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May be partially elastic

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Information is insufficient

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Solution

The correct option is A
Must be elastic

For a collision ofneutron with hydrogen atom in ground state to be inelastic ( partial or complete) the minimum KE ofstriking neutron must be 20.4 eV. [ This condition can be proved by using basic concepts]. As the energy of given incident neutron is less than 20.4eV the collision must be elastic.

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