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-   -   What is its half-life? (https://www.askmehelpdesk.com/showthread.php?t=521091)

  • Oct 28, 2010, 05:50 PM
    shanna339
    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?"
  • Oct 28, 2010, 11:03 PM
    Unknown008

    Use the formula:

  • Oct 29, 2010, 08:11 PM
    DrBob1
    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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