Phosphorus-32 is used in biochemical studies to follow the pathway taken by metabolites. Its half-life is 14.3 days. A vial containing 10μg of P-32 is accidentally spilled into a sink.
a) How long will it take P-32 in the drain to exhibit 65% of its original activity?
b) How many atoms of P-32 remain in the sink after 785 days?
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