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JIPMER Jipmer Medical Solved Paper-2006

  • question_answer
    The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons?

    A) 3eV     

    B)                        1.2eV                   

    C) 0.6 eV                  

    D)        1.4 eV

    Correct Answer: C

    Solution :

    Maximum kinetic energy of photoelectron \[{{(KE)}_{\max }}=E-\phi \] \[=1.8-1.2\] \[=0.6\,eV\] \[i.e,\]  \[e{{V}_{0}}={{(KE)}_{\max }}\] or            \[e{{V}_{0}}=0.6\,eV\] \[\therefore \] Stopping potential \[{{V}_{0}}=0.6\,eV.\]


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