A Radioactive Material Has a Half-Life of 2

question 29

Multiple Choice

A radioactive material has a half-life of 2.5 hours. The activity of a sample was measured to be 375 cps. What was the activity of the sample 6 hr, 15 min earlier?

• A) 60 cps
• B) 66 cps
• C) 8.6 × 10² cps
• D) 2.1 × 10³ cps
• E) 4.9 × 10³ cps

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Definitions:

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Elected bodies in the American colonies that represented colonists and had the authority to legislate and make decisions on local matters.

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Stamp Act

A 1765 British law imposed on the American colonies requiring them to pay a tax on printed materials, which led to widespread protest.

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