Answered

Some rocks brought back from the moon were dated as being 3.60 billion years old. What percentage of the potassium-40 has decayed after that time?

Express your answer with the appropriate units.



Answer :

GinnyAnswer

Final answer:

Potassium-40 decay percentage calculation in rocks aged 3.60 billion years.


Explanation:

Potassium-40 is used in isotopic dating of rocks, with a half-life of 1.3 billion years. When rocks were dated as 3.60 billion years old, after that time, approximately 12.5% of the original potassium-40 would have decayed.


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