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10-12-2017
Chemistry

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If a rock initially contained 10 milligrams of a radioactive substance when it first formed, how much remains after 4 half-lives?

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PaulJames PaulJames

10-12-2017

Well after the first half life it has 10/2 5 milligrams and the after the second half life it has 5/2 2.5
And the third 2.5/2 is 1.25
And the fourth 1.25/2 is 0.625

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