MHT CET Physics question

An electron with kinetic energy 5 eV is incident on an H-atom in its ground state. The collision

(A)must be elasticCorrect
(B)may be partially elastic
(C)may be completely elastic
(D)may be completely inelastic

Answer: (A)

Solution

The lowest excitation energy of a ground-state H atom is 10.2 eV, which is more than the 5 eV available, so the atom cannot absorb energy and the collision

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Question ID VK-084856