12th Class Chemistry Nuclear Chemistry Question Bank Critical Thinking Nuclear chemistry

  • question_answer The half-life of 1 gm of radioactive sample is 9 hours. The radioactive decay obeys first order kinetics. The time required for the original sample to reduce to 0.2 gm  is [AMU (Engg.) 2002]

    A)            15.6 hours                             

    B)            156 hours

    C)            20.9 hours                             

    D)            2.09 hours

    Correct Answer: C

    Solution :

           \[\frac{0.693}{9}=\frac{2.303}{t}\log \frac{1}{1-0.2}\]

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