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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2004

  • question_answer
    Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV, The minimum kinetic energy of the  emitted photoelectrons will be                     

    A)  zero                                     

    B)  1 eV            

    C)  2eV                                      

    D)  10 eV            

    Correct Answer: C

    Solution :

    According to Einstein's photoelectric equation \[hv=\phi +\frac{1}{2}m{{v}^{2}}\]                 or            \[6=4+\frac{1}{2}m{{v}^{2}}\]                 \[\Rightarrow \]               \[\frac{1}{2}m{{v}^{2}}=2eV\]


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