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13 March, 22:02

An igneous rock contains one half of its original amount of potassium 40 the age of the igneous rock is closest to what

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  1. 13 March, 23:43
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    So we want to know what is the age of igneous rock if it contains one half of its original amount of potassium 40. The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed. And its age is 1.251*10^9 years or 1.251 billion years.
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