Radon-222 Has a Half-Life of 3

question 33

Multiple Choice

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

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

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Definitions:

Significant Influence

The power to participate in financial and operating policy decisions of a business, but not control those policies.

Database

A structured set of data held in a computer, especially one that is accessible in various ways.

Amortized

The process of gradually paying off a debt or spreading the cost of an intangible asset over its useful life for accounting and tax purposes.