A Beam of 10¹² Neutrons/second Is Incident on an Aluminum

question 22

Multiple Choice

A beam of 10¹² neutrons/second is incident on an aluminum foil of thickness 10^-4 m. The cross section for absorption is 0.23 bn. What is the reaction rate for neutrons being absorbed?

• A)1.4 × 10¹¹/s
• B)1.4 × 10⁹/s
• C)1.4 × 10⁸/s
• D)1.4 × 10¹⁰/s
• E)1.4 × 10¹²/s

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Definitions:

Diminishing Marginal Utility

The decrease in satisfaction or usefulness obtained from each additional unit of consumption.

Inferior Good

A type of good for which demand decreases as the income of the consumer increases, due to the availability of more desirable substitutes.

Diminishing Marginal Utility

The principle that as a person consumes more of a good, the satisfaction gained from consuming an additional unit decreases.

Comparative Advantage

The ability to produce a good at a lower opportunity cost than others can produce it. Relative costs determine comparative advantage.