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? (AKS 4b, DOK 1)
O A. 15.6g would remain after 2100 million years had passed.
O B. 12.5g would remain after 3000 million years had passed.
O C. 12.5g would remain after 2100 million years had passed.
D. 15.6g would remain after 3000 million years had passed.