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

  • question_answer
    Half-life of \[B{{i}^{210}}\] is 5 days. If we start with 50,000          atoms of this isotope, the number of atoms left over after 10            days is [MP PET 1993]

    A)            5,000                                       

    B)            25,000                                     

    C)            12,500                                     

    D)            20,000

    Correct Answer: C

    Solution :

               \[_{Z}{{X}^{A}}\xrightarrow{_{-1}{{\beta }^{0}}}{{\,}_{Z+1}}{{Y}^{A}}\xrightarrow{2H{{e}^{4}}(\alpha )}\]\[{{\,}_{Z-1}}{{K}^{A-4}}\xrightarrow{_{0}{{\gamma }^{0}}}{{\,}_{Z-1}}{{K}^{A-4}}\]


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