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.


A

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