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14 January, 06:01

The half life of a radioactive element is 2 million years. a mass of rock originally contained 200g of this element. how many grams of the element are left after 4 million years?

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  1. 14 January, 06:25
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    Every 2 million years the amount is halved

    0 million = 200g

    2 million = 200g/2 = 100g

    4 million = 100g/2 = 50g
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