Open Question
The half-life for the radioactive decay of Ce-141 is 32.5 days. If a sample has an activity of 4.0 µCi after 130 days have elapsed, what was the initial activity, in microcuries, of the sample? (5.3, 5.4)
11. Nuclear Chemistry
Radioactive Half-Life
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What is the half-life of the radioisotope that shows the following plot of remaining percentage vs. time?
A
3 days
B
5 days
C
4 days
D
10 days
Verified step by step guidance1
Identify the initial percentage of the isotope remaining, which is 100% at time zero.
Determine the time at which the percentage of the isotope remaining is reduced to 50%. This is the half-life of the isotope.
Examine the graph and find the point where the curve intersects the 50% line on the y-axis.
Trace this point down to the x-axis to find the corresponding time in days.
Compare the time found with the given options (3 days, 5 days, 4 days, 10 days) to determine the correct half-life.
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