A Certain Factory Whistle Can Be Heard Up to a Distance

question 55

Multiple Choice

A certain factory whistle can be heard up to a distance of 2.5 km.Assuming that the acoustic output of the whistle is uniform in all directions,how much acoustic power is emitted by the whistle? The threshold of human hearing is 1.0 × 10^-12 W/m².

• A)0.079 mW
• B)0.026 mW
• C)0.26 mW
• D)0.79 mW
• E)2.6 mW

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Definitions:

Distribution Center

A specialized building designed for storing and sorting products to facilitate their distribution to retailers, wholesalers, or directly to consumers.

Best-seller

A product or book that has achieved significant sales figures compared to others in its category.

POS Terminal

A device used at retail locations to process sales transactions, accepting various forms of payment and recording purchase details.

UPC

Universal Product Code, a barcode used for tracking trade items in stores, consisting of a unique 12-digit numerical identifier.