A Certain Factory Whistle Can Be Heard Up to a Distance

question 137

Multiple Choice

A certain factory whistle can be heard up to a distance of 9.8 km.Assuming that the acoustic output of the whistle is uniform in all directions,at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10^-12 W/m².

• A)550 m
• B)660 m
• C)830 m
• D)940 m
• E)1,100 m

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Definitions:

Disposable Income

Disposable income for households after accounting for income taxes, meant for spending and saving.

Marginal Propensity

The ratio of change in an economic variable, such as consumption or saving, to a change in another variable, like income.

Disposable Income

The net income available to individuals or households after taxes have been deducted, available for spending, saving, or investing.

Consumption

The act of using goods and services by households, contributing to the overall demand in an economy.