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A pure sample of Ra-226 contains 2.0 $ 10-4 atoms of the isotope. If the half-life of Ra- 226 is 1.6 : 10 years and

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A pure sample of Ra-226 contains 2.0 $ 10-4 atoms of the isotope. If the half-life of Ra- 226 is 1.6 : 10 years and the decay constant is 0.000436 years, what is the decay rate of this sample? 13 : 10 10 decays/year 9.4 : 10 10 decays/year 6.7 10% decays/year 8.7 : 10 0 decays/year

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