How far can the MAD gain attention at 80 decibels without a waveguide?

The correct answer for how far the Metal Acoustic Device (MAD) can gain attention at 80 decibels without a waveguide is based on the operational parameters of the device, particularly its effective sound propagation capabilities. At 80 decibels, MAD is designed to produce an audible warning signal that can be heard at significant distances, particularly in open environments where sound can travel without obstruction.

The specified distance of 500 feet reflects the optimal range at which the sound remains above environmental noise levels and can effectively alert individuals in the vicinity. This particular range takes into consideration factors such as atmospheric conditions and surrounding noise, ensuring that the sound intensity is sufficient for recognition and response.

In contrast, other distances, such as 300 feet or 400 feet, would not provide the same assurance of reaching a wider audience, potentially limiting the device's effectiveness in mission scenarios where alerting personnel at a greater distance is crucial. Therefore, 500 feet represents a sound distance that aligns with the performance expectations set for the device, making it the correct choice.