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Uranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian Time? Explain.

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  1. Yesterday, 22:30
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    Answer: Uranium-235.

    Radioactive isotopes are used to determine the age of antique objects, including fossils.

    The half-life time of the radioactive elements is what permits the process of dating.

    The half-life of C-14 is too short to be useful to date too old objects.

    Precambrian time is the most antique era. C-14 hal-life is about 5730 years and Precambrian time is millions or billions of years ago. Given that the hal-life of U-235 is 704 million years it is appropiate to date the fossils from the Precambrian era.
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