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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    The work function of aluminium is 4.2 eV. If two photons each of energy 3.5 eV strike an electron of aluminium, then emission of electron will

    A) depend upon the density of the surface

    B) possible

    C) not possible

    D) None of these

    Correct Answer: C

    Solution :

    [c] Work function of aluminium is 4.2 eV. The energy of two photons cannot be added at the moment photons collide with electron all its energy will be dissipated or wasted as this energy is not sufficient to knock it out. Hence emission of electron is not possible.


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