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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Self Evaluation Test - Dual Nature of Radiation and Matter

  • question_answer
    The work function for sodium surface is 2.0 eV and that for aluminum surface is 4.2 eV. The two metal are Illuminated with appropriate radiation so as to cause photoemission. Then

    A) the threshold frequency for sodium will be less than that for aluminum  

    B) the threshold frequency for sodium will be more than that of aluminum

    C) both sodium and aluminum will have the same threshold frequency  

    D) none of the above

    Correct Answer: A

    Solution :

    [a] As work function \[W=h{{v}_{0}},\], where \[{{v}_{0}}\] is the threshold frequency. Greater the work function, greater is the threshold frequency. Therefore, the threshold frequency of sodium will be lesser than that for aluminum.


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