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

  • question_answer The half-life period of a radioactive substance is 140 days. After how much time 15 g will decay from 16 g sample of it [AFMC 2002]

    A)            140 days                                

    B)            560 days

    C)            280 days                                

    D)            420 days

    Correct Answer: B

    Solution :

           \[\frac{0.693}{140}=\frac{2.303}{t}\log \frac{16}{16-15}=560\,\text{days}\]

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