Concept explainers
To Calculate: The number of half-lives elapsed when the amount of a sample’s radioactive isotope is reduced to
Answer to Problem 43R
5 half-lives have elapsed when the amount of a sample’s isotope is reduced to 3.125 percent of original sample.
Explanation of Solution
Given info:
The given percentage is 3.125.
Formula used:
The number of half-lives is calculated by the formula given below:
Where,
Calculation:
By using the given information in the formula,
Conclusion:
The number of half-lives is
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