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JEE Main & Advanced Sample Paper JEE Main Sample Paper-31

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

    A) 340 min        

    B)                    12min

    C) 36min      

    D) 40 min

    Correct Answer: C

    Solution :

    Energy of 1 mol of photon\[=\frac{{{N}_{A}}hc}{\lambda }\] \[=\frac{6.023\times {{10}^{23}}\times {{10}^{-34}}\times 3\times {{10}^{8}}}{560\times {{10}^{-9}}}=213.69\times {{10}^{3}}J\] Time taken for this energy \[=\frac{213.6\times {{10}^{3}}J}{100\,\,J\,\,{{s}^{-1}}}=2136\,\,\sec \cong 36\,\,\min \]                


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