If an Isotope Has a Half-Life of 50 Million Years

question 14

Multiple Choice

If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that isotope, the age of the rock from which it was taken is:

• A) 400 million years.
• B) 300 million years.
• C) 150 million years.
• D) 800 million years.
• E) none of the above

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Definitions:

Highest Quintile

The top 20 percent of the population or distribution in a given set of data, often used in reference to income or wealth distribution.

Total Income

The sum of all wages, salaries, profits, interest payments, rents, and other forms of earnings received in a given period of time.

Household Income

The combined gross income of all members of a household.

Gini Ratio

A statistical measure used to represent the income or wealth distribution of a nation's residents, indicating economic inequality.