JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    Light of frequency \[8\times {{10}^{15}}Hz\] is incident on a substance of photoelectric work function \[6.125\,eV.\] The maximum kinetic energy of the emitted photoelectrons is

    A) 17\[eV\]

    B) 22\[eV\]

    C) 27\[eV\]

    D) 37\[eV\]

    Correct Answer: C

    Solution :

    [c] \[E=h\nu =6.6\times {{10}^{-34}}\times 8\times {{10}^{15}}=5.28\times {{10}^{-18}}J=33eV\] By using \[E={{W}_{0}}+{{K}_{\max }}\Rightarrow {{K}_{\max }}=E-{{W}_{0}}\] \[=33-6.125=27eV\]

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