The Radioactive Element Americium-241 Has a Half-Life of 432 Years

question 21

Multiple Choice

The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 20-g mass of americium-241 to decay to 7.8 g? Round your answer to the nearest year.

• A) 572 years
• B) 577 years
• C) 582 years
• D) 587 years

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Definitions:

Cost

The amount of cash or cash equivalents paid or the fair value of other consideration given to acquire an asset at the time of its acquisition or construction.

Profit Recognition

The process of reporting income when it is earned and realized or realizable, following accounting principles.

Line-By-Line Method

An accounting technique used in consolidation, where the parent company combines each item of the subsidiary's financial statements with its own, item by item.

Fair Value

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.