Half Life Problems
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whats a half-life?
The time it takes for the atoms in a radioisotope to decay
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes?
12.5 grams remaining
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 5.00 grams remains?
155.6 hours
If a half-life of 100.0 grams of a radioactive isotope is 8 years, how many grams will remain in 32 years?
6.25 grams
