A certain substance has a half-life of 5.0 hours.How many nuclei of the substance are required to give an initial activity of 6.0 μCi? 1 Ci = 3.7 × 
Bq.
A) 5.8 × 109
B) 8.5 × 108
C) 6.3 × 108
D) 3.2 × 109
E) 2.4 × 109
Correct Answer:
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