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    Question

    The half-life of an element is 5 years, what fraction of

    that radioactive substance will remain after 20 years?
    A ┬╜ Correct Answer Incorrect Answer
    B ┬╝ Correct Answer Incorrect Answer
    C 1/8 Correct Answer Incorrect Answer
    D 1/16 Correct Answer Incorrect Answer

    Solution

    t1/2 =5year 20 year = 20/5 = 4t1/2 4t1/2= (1/2)тБ┤= 1/16

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