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CMC Medical CMC-Medical Ludhiana Solved Paper-2012

  • question_answer
    The work function of a metal is\[1.6\times {{10}^{-19}}J,\]if a light of wavelength 6400\[\overset{\text{o}}{\mathop{\text{A}}}\,\] falls on its surface, then the maximum kinetic energy of emitted photo electron will be (Take Plancks constant\[h=6.4\times {{10}^{-34}}J\text{-}s\])

    A)  \[1.4\times {{10}^{-19}}eV\]     

    B)  \[1.4\times {{10}^{-19}}J\]         

    C)  \[14\times {{10}^{-19}}J\]                          

    D)  \[2.8\times {{10}^{-19}}J\]

    Correct Answer: B

    Solution :

                    Maximum kinetic energy \[{{K}_{\max }}=\frac{hc}{\lambda }-{{W}_{0}}\] \[=\frac{6.4\times {{10}^{-34}}\times 3\times {{10}^{8}}}{6400\times {{10}^{-10}}}-1.6\times {{10}^{-19}}\] \[=1.4\times {{10}^{-19}}J\]


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