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12th Class Chemistry Nuclear Chemistry / नाभिकीय रसायन Question Bank Critical Thinking Nuclear chemistry

  • question_answer
    A radioactive isotope has a \[{{t}_{1/2}}\] of 10 days. If today 125 gm of it is left, what was its weight 40 days earlier [EAMCET 1991]

    A)            \[600gm\]                             

    B)            \[1000gm\]

    C)            \[1250gm\]                           

    D)            \[2000gm\]

    Correct Answer: D

    Solution :

           \[{{t}_{1/2}}=10\,\text{days},N=125\]                    Calculate as, \[t=\frac{2.303\times {{t}_{1/2}}}{0.693}\log \frac{{{N}_{o}}}{125}\].


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