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

  • question_answer
    A photon of energy 8 eV is incident on metal surface of threshold frequency \[1.6\times {{10}^{15}}Hz.\] The maximum kinetic energy of the photoelectrons emitted (in eV) (Take \[h=6\times {{10}^{-34}}Js)\].                                             [MP. PET  2005]

    A)            1.6 

    B)            6

    C)            2    

    D)            1.2

    Correct Answer: C

    Solution :

               \[K.E.=h\nu -h{{\nu }_{0}}\]\[=8\ eV-\left( \frac{6\times {{10}^{-34}}\times 1.6\times {{10}^{15}}}{1.6\times {{10}^{-19}}}eV \right)\]            = \[8\ eV-6\ eV=2\ eV\]


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