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

  • question_answer
    The work function of a metal is 4.2 eV, its threshold    wavelength will be                                               [BHU 2003; CPMT 2004]

    A)         4000 Å                                        

    B)            3500 Å

    C)            2955 Å                                     

    D)            2500 Å

    Correct Answer: C

    Solution :

               \[{{W}_{0}}(eV)=\frac{12375}{{{\lambda }_{0}}}\,\Rightarrow \,{{\lambda }_{0}}=\frac{12375}{4.2}\approx \,2955\,{\AA}\]


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