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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    The atomic weight of thorium is 232 and atomic no Z = 90. Disintegration of thorium finally gives Pb for which A = 208 and Z = 82. For this process the number of \[\alpha \] and\[\beta \] particles respectively are

    A)  4 and 6         

    B)  6 and 4

    C)  3 and 2          

    D)  2 and 3

    Correct Answer: B

    Solution :

     \[_{90}T{{h}^{232}}{{\xrightarrow[{}]{{}}}_{82}}P{{b}^{208}}\] Number of a-particles\[=\frac{232-208}{4}=6\] Number of P-particles\[=6\times 2-(90-82)=4\]


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