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3. If a rock was determined to be around 3.9 billion years old how much Potassium so would be left in that rock sample?
(Percentage of Potassium 40)

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Answer:

The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.

Explanation:

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