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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Photon and Photoelectric Effect

  • question_answer
    The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein?s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 Å is/are           [CBSE PMT 2005]

    A)            None of these                     

    B)            A only

    C)            A and B only                         

    D)            All the three metals

    Correct Answer: C

    Solution :

                       Energy of incident radiations (in eV) \[=\frac{12375}{4100}=3.01\,eV\] Work function of metal A and B are less then \[3.01eV\], so A and B will emit photo electrons.


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