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Punjab Medical Punjab - MET Solved Paper-2001

  • question_answer
    Ultraviolet radiation of \[6.2\,\,eV\] falls on an aluminium surface (work function\[4.2\,\,eV\]). The kinetic energy in joule of the fastest electron emitted is approximately

    A) \[3\times {{10}^{-15}}\,\,J\]                       

    B) \[4\times {{10}^{-17}}\,\,J\]

    C) \[3\times {{10}^{-19}}\,\,J\]                       

    D) \[3\times {{10}^{-21}}\,\,J\]

    Correct Answer: C

    Solution :

    \[{{E}_{k}}=6.2-4.2=2\,\,eV\]                 \[=2\,\,eV=2\times 1.6\times {{10}^{-19}}\]                 \[=3.2\times {{10}^{-19}}\]                 \[\approx 3\times {{10}^{-19}}\]


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