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12 February, 14:04

You find a fossil that you think is about 350 million years old. You decide to use 235U to date a volcanic ash bed just below the key specimen. The half-life of 235U is 700 million years. If you are correct, what approximate percentage of the original 235U would you expect to remain in your sample?

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  1. 12 February, 16:48
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    I would expect that the sample has only 50% of the original 235 U.

    Explanation:

    That is because 235 U has a half-life of 700 million years and I expect that my sample be 350 million years old. 350 is half of 700.
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