A Sample of the Radioactive Isotope ⁹⁰Sr Was Found to Decay

question 97

Multiple Choice

A sample of the radioactive isotope ⁹⁰Sr was found to decay by a first order process. If 1.00% of the original 2.5×10 ^{- 3} gram sample decays in 0.406 years, determine the half-life of ⁹⁰Sr.

• A) 20.3 yr
• B) 1.61×10⁴ yr
• C) 2.46 yr
• D) 19.9 yr
• E) 28.0 yr

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A statistical mistake made when a true alternative hypothesis is incorrectly rejected, falsely indicating that the null hypothesis is true.

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