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BCECE Medical BCECE Medical Solved Papers-2014

  • question_answer
    Two radioactive sources X and Y of half lives 1 h and 2 h respectively initially contain the same number of radioactive atoms. At the end of 2 h, their rates of disintegration are in the ratio of

    A)  4 : 3  

    B)  3 : 4    

    C)  1 : 2    

    D)  2 : 1

    Correct Answer: C

    Solution :

    Rate of disintegration a number of atoms left For X      \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\] For Y      \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{1}}=\frac{1}{2}\] \[\therefore \] \[\frac{{{R}_{X}}}{{{R}_{Y}}}=\frac{4}{{{N}_{0}}}=\frac{1}{2}\]


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