Question

After three half-lives of an isotope, 1 billion (⅛) of the original isotope’s atoms still remain in a certain amount of this element. How many atoms of the daughter product would you expect to be present?

Answer 1

You would expect 500 million atoms to be present. When a source experiences a half-life, it is a point in which atoms have degraded to half what they used to be in mass. 1/2(1 billion) = 500 million

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