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Time (milions of yeas)
If you started with a 125g sample of U-235, how much of the sample would be remaining after 3 half-lives and how many years would
have passed?
A 15.6g would remain after 3000 million years had passed.
OB 15.6g would remain after 2100 million years had passed.
OC 12.5g would remain after 2100 million years had passed.
OD. 12.5g would remain after 3000 million years had passed.
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