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Dvinal [7]
3 years ago
6

1. Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca

atoms. How many years old is this rock?
Chemistry
1 answer:
zhuklara [117]3 years ago
5 0
1/2 of the original parent has decayed, thus one half- life has passed, and the rock is 1.3 billion = 1300 million years old
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