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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    The half-life of a radioactive element, \[^{222}Ruis\,3.8h,\] mass of this element which has activity equal to \[{{10}^{16}}\] Rutherford is:              

    A)  \[0.37\,kg\]                 

    B)  \[0.37g\]                 

    C)  \[0.073g\]          

    D)  \[0.07g\]  

    Correct Answer: C

    Solution :

        Now, number of particles in mass (m) \[N=\frac{m\times 6\times {{10}^{23}}}{222}\]             \[\therefore \]     \[{{10}^{16}}=\frac{0.693}{3.8\times 60\times 60}=\frac{m\times 6\times {{10}^{23}}}{222}\]                 \[\Rightarrow \]               \[m=0.073\,g\]            


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