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

  • question_answer
    Light of frequency 4n0 is incident on the metal of the threshold frequency n0. The maximum kinetic energy of the emitted photoelectrons is                                      [MP PET 2002]

    A)            \[3\,h{{\nu }_{0}}\]           

    B)            \[2\,h{{\nu }_{0}}\]

    C)            \[\frac{3}{2}\,h{{\nu }_{0}}\]

    D)            \[\frac{1}{2}h{{\nu }_{0}}\]

    Correct Answer: A

    Solution :

     \[E=h{{\nu }_{0}}+{{K}_{\max }}\Rightarrow h(4{{\nu }_{0}})=h{{\nu }_{0}}+{{K}_{\max }}\]\[\Rightarrow {{K}_{\max }}=3\,h{{\nu }_{0}}\].


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