Radioactive Decay: Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of these two nuclides. If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due
A. predominantly to Y.
B. predominantly to X.
C. entirely to Y.
D. to X and Y equally.
Answer: A
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