A pure sample of 226Ra contains 2.0 x 1014 atoms of the isotope.If the half-life of 226Ra = 1.6 x 103 years,what is the activity of this sample?
A) 6.7 x 109 decays/yr
B) 8.7 x 1010 decays/yr
C) 9.4 x 1010 decays/yr
D) 13 x 1010 decays/yr
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