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

question 64

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 ?Ci? (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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