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JEE Main & Advanced Sample Paper JEE Main Sample Paper-46

  • question_answer
    Time taken to produce 1 mol of photon by a \[100\,W\,(J{{s}^{-1}})\] yellow lamp in 1.0 s is (\[\lambda \] of yellow light is 500 nm)

    A)  40 min                       

    B)  36 min           

    C)  12 min                                   

    D)  340 min

    Correct Answer: B

    Solution :

     Energy of 1 mole of photon\[=\frac{{{N}_{0}}hc}{\lambda }\] \[=\frac{6.023\times {{10}^{23}}\times 6.626\times {{10}^{-34}}\times 3\times {{10}^{8}}}{560\times {{10}^{-9}}}\]\[=213.69\times {{10}^{3}}\,J\] Time taken for this energy \[=\frac{213.69\times {{10}^{3}}\,J}{100\,J{{s}^{-1}}}=2137\,s=36\,\min \]


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