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22 January, 00:25

A rock formed with 1,000 atoms of a radioactive parent element, but only contains 12.5% of its original radioactive parent atoms today. if the half-life is 1,000,000 years, how old is the rock? (ess 4.6)

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  1. 22 January, 04:23
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    The rock is 2,000,000 years old.
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