The Half-Life of the Radium Isotope Ra-226 Is Approximately 1,599

question 18

Multiple Choice

The half-life of the radium isotope Ra-226 is approximately 1,599 years. If the initial quantity of the isotope is 38 g, what is the amount left after 1,000 years? Round your answer to two decimal places.

• A) 24.63 g
• B) 30.60 g
• C) 25.13 g
• D) 11.88 g
• E) 12.32 g

---

Definitions:

Profit-Maximizing

A strategic goal of firms to achieve the highest possible profit given their costs of production and market demand.

Fixed Costs

Expenses that do not vary with the level of output, such as rent, salaries, and loan payments.

Monopolistically Competitive

A market structure characterized by many firms offering products that are similar but not identical, leading to differentiated competition.

Total Revenue

The entirety of income a company secures from its sales or service activities over a certain period.