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NEET Sample Paper NEET Sample Test Paper-53

  • question_answer
    In the diagram shown a uniform electric field E is applied in a direction perpendicular to plates as shown. The work function of metal plates is \[h\nu \] and incident light has photon energy\[2h\nu \]. What will be the maximum kinetic energy of \[{{e}^{-}}\] when reaching at plate 2?

    A) \[h\nu \]                        

    B) \[h\nu +eEd\]

    C) \[h\nu -eEd\]                  

    D) \[2h\nu -eEd\]

    Correct Answer: C

    Solution :

    \[2h\nu \,\,=\,\,h\nu \,\,+\,\,K{{E}_{max}}\] \[K{{E}_{max}}=\,\,h\nu \] on reaching 2nd plates electron are retarded through potential difference eED so \[K{{E}_{remaining}}=\left( h\nu -eEd \right)\]


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