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    shanna339's Avatar
    shanna339 Posts: 1, Reputation: 1
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    #1

    Oct 28, 2010, 05:50 PM
    What is its half-life?
    A sample of radioactive isotope with an original mass of 10.0 grams is observed for 24 days. After that time, 1.25 grams of the isotope remains. What is its half-life?"
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 28, 2010, 11:03 PM

    Use the formula:
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #3

    Oct 29, 2010, 08:11 PM
    Just divide 10 grams by 2 until only 1.25 grams are left. How many steps did that take? How many hours or days did each step take? There is your half life.
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