The Half-Life of Bromine-74 Is 25 Min

question 7

Multiple Choice

The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min?

• A)0.25 mg
• B)0.50 mg
• C)4.0 mg
• D)1.0 mg
• E)2.0 mg

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