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

  • question_answer
    The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is             [CBSE PMT 1999; KCET 2001]

    A)            4125 Å                                     

    B)            2062.5 Å

    C)            3000 Å                                     

    D)            6000 Å

    Correct Answer: C

    Solution :

               \[W.\,(eV)=\frac{12375}{{{\lambda }_{0}}({\AA})}\Rightarrow {{\lambda }_{0}}=\frac{12375}{4.125}=3000{\AA}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner