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What is the activity of a sample of C that contains 5.3x1020 nuclei? The half-life of C is 5700 years.
Express your answer using two significant figures.
?
ΔΝ
decays/s
At

Part A
How many nuclei of U remain in a rock if the activity registers 640 decays per second? The half-life is 4.468x10° yr.
238
92
Express your answer using two significant figures.
N =
nuclei

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