A Certain Factory Whistle Can Be Heard Up to a Distance

question 18

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 $1.0 \times 10 ^ { - 12 } \mathrm {~W} / \mathrm { m } ^ { 2 }$

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

---

Definitions:

Formal Messages

Communication that follows a professional structure, language, and format, often used in business or official contexts.

Headings

Titles or labels used in written material to organize content and aid in navigation and understanding by the reader.

Extravagantly Changed

Describes something that has been altered or modified in an excessive, elaborate, or luxurious manner.

Informal Words

Language typically used in casual or personal conversations, characterized by a relaxed tone and common, everyday expressions.