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NEET Sample Paper NEET Sample Test Paper-20

  • question_answer
    If a substance with half-half 3 days is taken at other place in 12 days, then what amount of substance is left now?

    A)  1/8                             

    B)  1/4                 

    C)  1/16                 

    D)       1/2

    Correct Answer: C

    Solution :

    \[T=12\,days\,{{t}^{1/2}}=3\,days\]  \[n\](number of half-lives)\[=\frac{12}{3}=4\] Amount of substance left\[=\frac{{{N}_{0}}}{{{2}^{n}}}\]                         \[=\frac{{{N}_{0}}}{{{2}^{4}}}=\frac{{{N}_{10}}}{16}\] So,\[\frac{1}{16}\] of the original amount is the answer. Hence, the correct option is (c).


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