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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Artificial Transmutation

  • question_answer
    The radioisotope, tritium \[(_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg. How many milligrams of it would remain after 49.2 years     [CBSE 2003]

    A)                 8 mg     

    B)                 1 mg

    C)                 2 mg     

    D)                 4 mg

    Correct Answer: C

    Solution :

              \[{{N}_{t}}={{N}_{o}}\,{{\left( \frac{1}{2} \right)}^{n}}\]\[=32\times {{\left( \frac{1}{2} \right)}^{49.2/12.3}}\]\[=32\times {{\left( \frac{1}{2} \right)}^{4}}=2\].


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