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    Wildcat14's Avatar
    Wildcat14 Posts: 1, Reputation: 1
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    Apr 14, 2016, 09:51 PM
    Lead-214 has a half life of 27 minutes if you started with 500 grams of this isotope how many grams would you have after 54 minutes
    ebaines's Avatar
    ebaines Posts: 12,129, Reputation: 1307

    Apr 15, 2016, 09:27 AM
    Every 27 minutes the amount of radioactive material is cut in half. So, starting with 500 grams, at T=27 minutes half of that original amount is remaining. And then after an additional 27 minutes (i.e. at T=54 minutes) half of the amount you had at T=27 minutes is remaining. How much is that?

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