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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Radioactivity

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     10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is [Pb. PMT 2002]

    A)            12.5 g                                      

    B)            10.5 g

    C)            6.03 g                                      

    D)            4.03 g

    Correct Answer: C

    Solution :

                       Remaining material \[N=\frac{{{N}_{0}}}{{{2}^{t/T}}}\]                    \[\Rightarrow N=\frac{10}{{{(2)}^{20/15}}}=\frac{10}{2.15}=3.96\ gm\]            So decayed material \[=10-3.96=6.04\ gm\]


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