What Is the Number of Half-Lives Needed for a Radioactive

question 28

Multiple Choice

What is the number of half-lives needed for a radioactive element to decay to one-fourth of its original activity? (Choose the nearest number.)

• A) 1
• B) 4
• C) 3
• D) 5
• E) 2

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Definitions:

National Income

The total income earned by a country's residents and businesses, including wages, profits, and investment earnings, usually measured within a specific time period.

Transfer Payments

Payments made by governments to individuals through social benefit programs without any goods or services being received in return.

Real Return

The profit or income generated by an investment, adjusted for inflation, representing the true increase in purchasing power.