How far away can a whistle be heard in favourable weather conditions?

How far away can a whistle be heard in favourable weather conditions?

• A. Up to 2 miles
• B. Up to 4 miles
• C. Up to 6 miles
• D. Up to 1 mile

Answer: (B)

The distance a whistle can be heard outdoors depends on how loud the whistle is, how far the sound travels, and the weather. In favorable weather—calm air, no heavy background noise, and no obstacles—the sound from a whistle travels farther because there’s less distortion and attenuation. A typical safety whistle is loud enough that, under these good conditions, its signal remains detectable by a listener at about four miles away. So four miles is a practical upper bound for hearing a standard whistle when conditions are ideal. If the weather is not favorable—there’s wind, rain, or lots of surrounding noise—the audible distance drops, often to about a mile or two or even less.

The distance a whistle can be heard outdoors depends on how loud the whistle is, how far the sound travels, and the weather. In favorable weather—calm air, no heavy background noise, and no obstacles—the sound from a whistle travels farther because there’s less distortion and attenuation. A typical safety whistle is loud enough that, under these good conditions, its signal remains detectable by a listener at about four miles away. So four miles is a practical upper bound for hearing a standard whistle when conditions are ideal. If the weather is not favorable—there’s wind, rain, or lots of surrounding noise—the audible distance drops, often to about a mile or two or even less.