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VMMC VMMC Medical Solved Paper-2009

  • question_answer
    If half-life of a radio isotope is 2 s and number of atoms are only 4, then after one half-life remaining (without decay) atoms are probably

    A)  1            

    B)                                                         2                            

    C)                         3                                            

    D)                         All of these

    Correct Answer: B

    Solution :

    Fraction of atoms remained after time t Is             \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\] Here,     \[{{T}_{1/2}}=2s\] and       \[{{N}_{0}}=4\]                 \[T=2s\] \[\Rightarrow \]               \[\frac{N}{4}=\frac{1}{2}\] or            \[N=2\]


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