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

  • question_answer
    Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface                                      [Bihar MEE 1995]

    A)            4000 Å, 7500 Å                     

    B)            5500 Å, 6000 Å

    C)            4000 Å, 6000 Å                     

    D)            None of these

    Correct Answer: D

    Solution :

               Threshold wavelength \[{{\lambda }_{0}}=\frac{12375}{2.1}=5892.8\,{\AA}\]


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