A Certain Substance Has a Half-Life of 5 $10^{10}$ Bq)
A) 5

question 69

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 × $10^{10}$ Bq)

• A) 5.8 × \(10 ^ { 9 }\) nuclei
• B) 8.5 × \(10^8\) nuclei
• C) 6.3 × \(10^8\) nuclei
• D) 3.2 × \(10 ^ { 9 }\) nuclei
• E) 2.4 × \(10 ^ { 9 }\) nuclei

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