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

  • question_answer
    An atomic nucleus \[_{90}T{{h}^{232}}\] emits several a and b radiations and finally reduces to \[_{82}P{{b}^{208}}\]. It must have emitted [MP PET 2003]                                              

    A)            4a and 2b                              

    B)            6a and 4b

    C)            8a and 24b                           

    D)            4a and 16b

    Correct Answer: B

    Solution :

                       \[{{n}_{\alpha }}=\frac{A-A'}{4}=\frac{232-208}{4}=6\] \[{{n}_{\beta }}=2{{n}_{\alpha }}-Z+Z'=2\times 6-90+82=4\]


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