Radioactive Elements Decay Via First-Order Kinetics

question 33

Multiple Choice

Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 1.0 × 10^-3 h^-1. A sample contains 5.0 × 10⁹ radioactive nuclides. Calculate the number of nuclides remaining after 39 days have passed.

• A) 64
• B) 7.8 × 10^-11
• C) 2.0 × 10⁹
• D) 5.0 × 10⁹
• E) 2.5 × 10⁹