The half-life of uranium-235 is 700 million years. If there are 2000 g of uranium-235 in the original sample, what happens after 2100 million years have passed? Select all that apply.
A.
One half-life has passed.
B.
500 g of the original sample remains.
C.
Two half-lives have passed.
D.
250 g of the original sample remains.
E.
125 g of the original sample remains.
F.
Three half-lives have passed.
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