An electron with kinetic energy `5eV` is incident on a hydrogen atom i – InterviewSolution

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1.	An electron with kinetic energy `5eV` is incident on a hydrogen atom in its ground state.The collisionA. must be elasticB. may be partially elasticiC. must be completely inelasticD. may be completely inelastic
Answer» Correct Answer - A In hydrogen atom `E_(2)-E_(1)=10.2 eV` Since,` " " 5 eV lt 10.2 eV` The electron cannot excite the hydrogen atom. The collision must be therefore elastic .

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