Chemistry, 20.09.2019 17:20 Lizzy527663
Apaleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. the rock now contains 3 mg of potassium-40. the half-life of patassium-40 is 1.3 billion years. about how old is the rock? a. 0.4 billion yearsb. 0.3 billion yearsc. 1.3 billion yearsd. 2.6 billion yearse. 5.2 billion years
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