A Sample of Radon Has an Activity of 90,000 Bq

question 65

Multiple Choice

A sample of radon has an activity of 90,000 Bq. If the half-life of radon is 15 h, how long before the sample's activity is 5,625 Bq?

• A) 60 h
• B) 90 h
• C) 15 h
• D) 30 h
• E) 45 h

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Definitions:

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