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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The number of beta particles emitted in the radioactive decay series from \[^{238}{{U}_{92}}\]to \[^{206}P{{b}_{82}}\]is

    A)  10             

    B)  8               

    C)  6                

    D)  2               

    Correct Answer: C

    Solution :

     Number of \[\beta -\]particles \[\text{=}\,\text{2}\,\text{ }\!\!\times\!\!\text{ }\,\]no. of \[\alpha \] particles \[-\]change in atomic number Number of \[\alpha -\]particles \[=\frac{238-206}{4}\] \[\therefore \]No. of \[\beta -\]particles \[=2\times 8-(92-82)\] \[=16-10\] \[=6\]


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