Posted by **Sandhya** on Friday, April 18, 2008 at 9:16pm.

1) The number of radioactive nuclei in a particular sample decreases over a period of 15 days to one-seventeenth the original number. What is the half-life (in days) of these nuclei?

2) What is the activity of a sample of 14C that contains 1.22E+21 nuclei?

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