Radioactive ⁹⁰Sr Has a Half-Life of 30 Years

question 1

Multiple Choice

Radioactive ⁹⁰Sr has a half-life of 30 years. What percent of a sample of ⁹⁰Sr will remain after 60 years?

• A) 0%
• B) 25%
• C) 50%
• D) 75%
• E) 14%

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Definitions:

Gilded Age

A term describing the late 19th century period in the United States characterized by rapid economic growth, technological advancement, and superficial wealth.

Social Order

An arrangement of practices and behaviors on which society’s members base their daily lives, aiming at maintaining societal stability and predictability.

Class Differences

Describes the distinctions made between individuals or groups based on their social and economic positions within society.