ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!


    Question

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

    time in which only 1/8th of the original substance remains is:
    A 20 days Correct Answer Incorrect Answer
    B 30 days Correct Answer Incorrect Answer
    C 40 days Correct Answer Incorrect Answer
    D 80 days Correct Answer Incorrect Answer

    Solution

    When only 1/8 of the substance remains, it means 3 half-lives have passed because: (1/2)┬│ = 1/8 Each half-life is 10 days, so total time = 3 ├Ч 10 = 30 days. Therefore, the correct answer is 30 days.

    Practice Next
    More Physics GS Questions

    Relevant for Exams:

    ask-question