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A Certain Substance Has a Half-Life of 5

Question 81

Multiple Choice

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 × 1010 Bq.


A) 5.8 × 109 nuclei
B) 8.5 × 108 nuclei
C) 6.3 × 108 nuclei
D) 3.2 × 109 nuclei
E) 2.4 × 109 nuclei

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