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14 December, 07:35

The half-life of a radioactive substance is the average amount of time it takes for half of its atoms to disintegrate. Suppose you started with 200 grams of a substance with a half-life of 3 minutes. How many minutes have passed if 25 grams now remain? Explain your reasoning.

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  1. 14 December, 10:36
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    3 half-lives because 200/2=100 100/2=50 and 50/2=25
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