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

  • question_answer
    If work function of metal is 3\[eV\] then threshold wavelength will be                     [RPMT 2000]

    A)            4125 Å                                     

    B)            4000 Å

    C)            4500 Å                                     

    D)            5000 Å

    Correct Answer: A

    Solution :

               \[{{\lambda }_{0}}=\frac{12375}{{{W}_{0}}(eV)}=\frac{12375}{3}=4125{\AA}\]


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