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Radioactive ⁹⁰Sr Has a Half-Life of 30 Years

Question 61

Question 61

Multiple Choice

Radioactive ⁹⁰Sr has a half-life of 30 years.What percent of a sample of ⁹⁰Sr will remain after 60 years?

A) 0%
B) 14%
C) 25%
D) 50%
E) 75%

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