Question:
A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40, which has a half-life of 1.25 billion years. The rock now contains 3 mg of the isotope. About how old is the rock?
Author: Incredible SnipeAnswer:
2.5 billion years
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5 answer(s) in total
Alternative answers:
0.4 billion years
0.3 billion years
1.25 billion years
5.0 billion years
Author
Incredible Snipe