12.4 Exercise 5

What is the half-life for the first-order decay of phosphorus-32? $\left(_{15}^{32} \text{P} \rightarrow _{16}^{32} \text{S} + \text{e}^{-}\right)$ The rate constant for the decay is 4.85 $\times$ 10⁻² day⁻¹.