A Certain Substance Has a Half-Life Of $5.0$ Hours How Many Nuclei of the Substance Are Required to Many

question 94

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 $6.0 \mu \mathrm { Ci }$ ? $\left( 1 \mathrm { Ci } = 3.7 \times 10 ^ { 10 } \mathrm {~Bq} \right)$

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

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