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11 September, 22:37

Uranium-238 decays to Lead-206. Both Rock X and Rock Y initially had a ratio of 100%. Uranium-238 to 0% Lead-206. Today, Rock X has a ratio of 50%. Uranium-238 to 50% Lead-206. Rock Y has a ratio of 25% Uranium-238 to 75% Lead-206. Which rock is older?

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  1. 11 September, 23:02
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    Rock Y

    Explanation:

    The rock that is older shall be determined based on the number of half lives it has witnessed. A half life is simply the amount of time required for a sample to decay to half of its original mass.

    Rock X

    From 100% uranium, it decays to 50% uranium. This means it went through just one half life.

    Rock Y

    From 100% uranium to 25% uranium

    100 - -> 50 (first half life)

    50 - -> 25 (second half life)

    This means it wen through 2 half lives.

    Rock Y is older than Rock X
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Home » Chemistry » Uranium-238 decays to Lead-206. Both Rock X and Rock Y initially had a ratio of 100%. Uranium-238 to 0% Lead-206. Today, Rock X has a ratio of 50%. Uranium-238 to 50% Lead-206. Rock Y has a ratio of 25% Uranium-238 to 75% Lead-206.
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