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Nuclide X has a half-life of 1 day and nuclide Y has a half-life of 5 days. In a particular sample, the activities of X and Y are found to be equal. When the activity is tested again after 10 days, the activity will be ________.

A. Entirely due to nuclide X.

B. Due equally to nuclides X and Y.

C. Mostly due to nuclide X.

D. Mostly due to nuclide Y.

Asked by Gboulton, Last updated: Jun 25, 2018