The isotope ²⁰¹Th is used in the diagnosis of heart disease. It has a first-order rate constant, k, of 9.49 $\times$ 10^-3 h^-1. What is the half-life for ²⁰¹Th? A)73 hr B)0.014 hr C)9.49 $\times$10^-3 hr D)7.3 hr E)1.4 hr

Question

Quizplus · Accepted Answer

The half-life (t1/2) of a first-order reaction is given by the formula t1/2 = 0.693/k. Given k = 9.49 × 10^-3 hr^-1, substituting into the formula gives a half-life of approximately 73 hours.

The Isotope 201Th Is Used in the Diagnosis of Heart ×\times×

The Isotope ²⁰¹Th Is Used in the Diagnosis of Heart $\times$