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

  • question_answer
    Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wave length of photo ? electrons is 5420 Å. The work function of sodium is  [MP PMT 1993; Pb. PMT 2002]

    A)            4.58 eV                                   

    B)            2.29 eV                                   

    C)            1.14 eV                                   

    D)            0.57 eV

    Correct Answer: B

    Solution :

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


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