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19 June, 21:38

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?

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  1. 19 June, 23:46
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    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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