The nucleus 15 8O has a half-life of 122.2 s; 19 8O has a
Chapter 43, Problem 43.62(choose chapter or problem)
The nucleus 15 8O has a half-life of 122.2 s; 19 8O has a half-life of 26.9 s. If at some time a sample contains equal amounts of 15 8O and 19 8O, what is the ratio of 15 8O to 19 8O (a) after 3.0 min and (b) after 12.0 min?
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