Radioactive Elements Decay Via First-Order Kinetics

question 39

Multiple Choice

Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 1.9× 10^-2 h^-1. A sample contains 6.6× 10⁸ radioactive nuclides. Calculate the time required to reduce that number to 2.8× 10⁸.

• A) 4.5 h
• B) 2.0 × 10¹⁰ h
• C) 4.5 × 10¹ h
• D) 2.0 × 10¹ h
• E) 8.1 × 10^-1 h

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