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23 September, 14:52

Radioactive decay of 40k atoms in an igneous rock has resulted in a radio of 25 percent 40k atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock

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  1. 23 September, 16:30
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    In order to answer this, we would need to know

    the half-life of ⁴⁰K. Perhaps when you look that up,

    you'll be able to answer this on your own.
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