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

  • question_answer
    The photoelectric threshold wavelength for potassium (work function being \[2eV\]) is [CPMT 2001]

    A)            310 nm                                   

    B)            620 nm

    C)            1200 nm                                 

    D)            2100 nm

    Correct Answer: B

    Solution :

               \[\lambda =\frac{12375}{{{W}_{0}}}=\frac{12375}{2}=6187.5{\AA}\]\[=620\ nm\]


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