객관식
If a parent isotope has a half-life of 1.75 million years, how much of the original sample will remain after 3.5 million years?
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15. Chemical Kinetics
Half-Life
객관식
Iodine-131 has a half-life of 8.0 minutes. How many half-lives will pass in 120 minutes?
A
15
B
10
C
12
D
8
검증된 단계별 안내1
Identify the given information: the half-life of iodine-131 is 8.0 minutes, and the total time elapsed is 120 minutes.
Recall the formula to find the number of half-lives passed: \(\text{Number of half-lives} = \frac{\text{Total time elapsed}}{\text{Half-life}}\).
Substitute the given values into the formula: \(\text{Number of half-lives} = \frac{120}{8.0}\).
Perform the division to find how many half-lives have passed (do not calculate the final number here, just set up the expression).
Interpret the result as the number of times the iodine-131 sample has undergone decay by half during the 120 minutes.
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