If the half-life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds? A. one-fourth B. half C. one-eighth D. You would need to know how many atoms you are starting with.
Chemistry · High School · Tue Nov 03 2020
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C. one-eighth
After 60 seconds, one-eighth (25%) of the radioactive substance would be left.