Radon-222 Has a Half-Life of 3

question 143

Multiple Choice

Radon-222 has a half-life of 3.8 days.An air sample from a basement in Colorado was analyzed 5.0 days after it was collected and found to have a radon activity level of 0.17 Bq/L.What was the original activity of this sample?

• A)0.22 Bq/L
• B)0.32 Bq/L
• C)0.42 Bq/L
• D)0.62 Bq/L
• E)0.52 Bq/L

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