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KVPY Sample Paper KVPY Stream-SX Model Paper-21

  • question_answer
    An electron of the kinetic energy 10 eV collides with a hydrogen atom in 1st excited state. Assuming loss of kinetic energy in the collision to be quantized which of the following statements is incorrect.

    A) The collision may be perfectly inelastic

    B) The collision may be inelastic

    C) The collision may be elastic

    D) The collision must be inelastic

    Correct Answer: D

    Solution :

    In the process of collision, the electron (because of very low mass in comparison to hydrogen atom) can loose upto 10 eV. 10 eV is sufficient to ionize the hydrogen atom or excite to higher the hydrogen atom or excite to higher excited state from first excited state. Hence, the collision can be elastic, inelastic or perfectly inelastic.


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