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

  • question_answer
    If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is   [RPMT 2003]

    A)            4.58 eV                                   

    B)            2.28 eV

    C)            1.14 eV                                   

    D)            0.23 eV

    Correct Answer: B

    Solution :

               \[{{W}_{0}}=\frac{12375}{{{\lambda }_{0}}}=\frac{12375}{5420}=2.28\,eV\]


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