A pure sample of 226Ra contains 3.0 * 1014 atoms of the isotope. If the half-life of 226Ra = 1.6 * 103 years, what is the activity of this sample?
A) 13 * 1010 decays/yr
B) 9.4 * 1010 decays/yr
C) 6.7 * 109 decays/yr
D) 8.7 *1010 decays/yr
Correct Answer:
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