A Geological Sample Is Found to Have a Pb-206/U-238 Mass

question 15

Multiple Choice

A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00.Assuming there was no Pb-206 present when the sample was formed,how old is it? The half-life of U-238 is 4.5 × 10⁹ years.

• A) 7.3 × 10¹¹ years
• B) 1.4 × 10¹⁰ years
• C) 2.4 × 10¹⁰ years
• D) 2.1 × 10⁹ years
• E) 7.1 × 10⁹ years

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Definitions:

Linear Model

A statistical method that describes the relationship between two or more variables using a straight line.

Regression

A statistical method used to understand the relationship between a dependent variable and one or more independent variables.

Kilowatt-Hours

A unit of energy measurement equal to the power consumption of one thousand watts for one hour.

Square Feet

A unit of area measurement in the Imperial and US customary systems, used to measure the size of an area.