CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2003

  • question_answer
    A signature, written in carbon pencil weighs 1 mg. What is the number of carbon atoms present in the signature?

    A)  \[5.02\times {{10}^{23}}\]          

    B)  \[5.02\times {{10}^{20}}\]

    C)  \[6.02\times {{10}^{20}}\]                          

    D)  \[0.502\times {{10}^{20}}\]

    Correct Answer: D

    Solution :

    \[\because \] Number of atoms present in 12 g carbon                 \[=6.023\times {{10}^{23}}\] \[\therefore \] No. of atoms present in 1 mg carbon                 \[=\frac{6.023\times {{10}^{23}}\times 1}{12\times 1000}\]                 \[=0.502\times {{10}^{20}}\]


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