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    Question

    Half-life of a radioactive substance is 10 days. The

    time after which only 1/16th of it remains is:
    A 40 days Correct Answer Incorrect Answer
    B 30 days Correct Answer Incorrect Answer
    C 20 days Correct Answer Incorrect Answer
    D 10 days Correct Answer Incorrect Answer

    Solution

    The substance reduces to 1/2 every 10 days. Time = n x Half-life Given: Half-life = 10 days Final amount = 1/16 of original Thus, Time = n x Half-life = 4. 10 = 40 days

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