Final answer:
The half-life of a substance like Vraylar would follow the same principles as half-life measurements for other substances, where a certain percentage remains after each half-life period.
Step-by-step explanation:
The half-life of a drug like Vraylar (not specifically mentioned in the provided information, but generally for medication) can be understood through the given principles of half-life measurements. For example, cobalt-60 has a half-life of 5.27 years, meaning that after 5.27 years, only 50% of the original amount remains, and this principle applies to various substances, including medications. In the case of Ac-225, with a stated half-life of 10 days, 50% of the substance would remain after 10 days.
If we are to calculate a half-life based on a given reaction rate, as in the solution provided, the calculation would follow the formula 0.693/(reaction rate). Thus, if we have a reaction rate, we could determine the half-life of Vraylar accordingly.