Radioactive Decay: the Material Used in Certain Nuclear Bombs Is

question 82

Multiple Choice

Radioactive decay: The material used in certain nuclear bombs is ²³⁹Pu, which has a half-life of about 20,000 years. How long must we wait for a buried stockpile of this substance to decay to 4.0% of its original ²³⁹Pu mass?

• A) 93,000 y
• B) 64,000 y
• C) 45,000 y
• D) 800 y

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