Question
How much of the parent isotope would be remaining after 7 half-lives have passed?a. $6.25 \%$b. $1.56 \%$c. $0.78 \%$d. $0.39 \%$
Step 1
After 2 half-lives, 50% of the remaining 50% remains, which is 25%. After 3 half-lives, 50% of the remaining 25% remains, which is 12.5%. After 4 half-lives, 50% of the remaining 12.5% remains, which is 6.25%. Show more…
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