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NEET Sample Paper NEET Sample Test Paper-33

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

    A) must be elastic

    B) may be partially elastic

    C) may be completely inelastic

    D) may be completely elastic

    Correct Answer: A

    Solution :

    Key Idea: In elastic collision energy an momentum both are conserved. In hydrogen atom\[{{E}_{2}}-{{E}_{1}}=10.2eV\]. Since, energy difference is\[10.2eV\]. Which is greater that kinetic energy \[5eV\] the electron excites the hydrogen atom, hence collision in elastic.


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