CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2011

  • question_answer
    The fraction of the initial number of radioactive nuclei which remain undecayed after half of a half-life of the radioactive sample is

    A)  \[\frac{1}{4}\]                                  

    B)  \[\frac{1}{2\sqrt{2}}\]

    C)  \[\frac{1}{2}\]                                  

    D)  \[\frac{1}{\sqrt{2}}\]

    Correct Answer: D

    Solution :

                    \[{{N}_{0}}={{2}^{n}}N\]                 \[N=\frac{{{N}_{0}}}{{{2}^{n}}}=\frac{{{N}_{0}}}{{{2}^{4/2}}}=\frac{{{N}_{0}}}{\sqrt{2}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner