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:

Factory Overhead

Every manufacturing-related expense excluding the costs of direct materials and direct labor.

Direct Materials

Raw materials that are directly used in the production of goods, identifiable as part of the finished product.

Factory Supervisor

An individual responsible for overseeing the operations and workers in a manufacturing plant or a section thereof.

Indirect Cost

Costs that are not directly traceable to a specific project, product, or activity and usually include overheads such as administration and utilities.