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:

Balance Sheet

An accounting document summarizing assets, liabilities, and owners' equity of a business on a specific date.

Sales On Account

Transactions where goods are sold and payment is deferred, allowing the buyer to pay at a later date, typically generating accounts receivable for the seller.

Average Sale Period

The average time it takes for a company to sell its inventory, often used to assess the efficiency of sales operations.

Financial Statements

Formal records of the financial activities and position of a business, person, or other entity, presenting its financial performance and position over a defined period.