The Radioactive Isotope Tritium Decays with a First-Order Rate Constant

question 17

Multiple Choice

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr^-1. What fraction of the tritium initially in a sample is still present 30. years later?

• A) 0.19
• B) 0.60
• C) 0.15
• D) 2.8 × 10^-38
• E) 0.81

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