Uranium-238 is a radioactive element that will decay into lead-206. It has a half-life of 4.5 billion years, which means that after 4.5 billion years exactly one-half of the total amount of uranium-238 that you started with will have decayed into lead-206. Suppose you were given a 100-gram, solid block of uranium-238, and you buried it in the ground. Nine billion years from now, if someone dug it up and analyzed it, how much uranium-238 would be left?

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    25 grams
    50 grams
    0 grams
    100 grams
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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25 grams
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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