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

question 40

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 is correct.

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