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Question 6.2.2: An isotope has a half-life of 20 min. If initially there is ...

An isotope has a half-life of 20 min. If initially there is 1024 g of this isotope, how much time must go by for there to be 128 g left?

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The nuclei have been reduced by a factor of 8 . Thus, 3 half-lives or 60 min must have gone by.

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