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

question 47

Multiple Choice

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year⁻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)None of these choices are correct.