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KVPY Sample Paper KVPY Stream-SX Model Paper-6

  • question_answer
    In a radioactive decay chain, the initial nucleus is \[_{90}^{232}Th.\] At the end there are \[6\alpha -\]particles and \[4\beta \]particles with are emitted. If the end nucleus is\[_{Z}^{A}X,\] A and Z are given by:

    A) \[A=208;\text{ }Z=80\] 

    B) \[A=202;\text{ }Z=80\]

    C) \[A=280;\text{ }Z=82\] 

    D) \[A=200;\text{ }Z=81\]

    Correct Answer: C

    Solution :

    \[_{90}^{232}Th\xrightarrow{6a}_{78}^{208}Y\xrightarrow{4\beta }_{82}^{208}X.\]


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