The Radioactive Element Americium-241 Has a Half-Life of 432 Years

question 21

Multiple Choice

The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 20-g mass of americium-241 to decay to 7.8 g? Round your answer to the nearest year.

• A) 572 years
• B) 577 years
• C) 582 years
• D) 587 years

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Definitions:

Inflation Rate

The escalation in overall prices for goods and services, leading to a drop in how much can be bought.

Annual

Relating to or denoting a period of one year.

Nominal Rate

The stated interest rate of a financial product, not adjusted for inflation, representing the face value of interest payments.

Real Rate

The interest rate adjusted for inflation, reflecting the true cost of borrowing or the true yield on an investment.