What type of noise level is not allowed for any motorboat measure from 50 feet?

The correct measure of noise level not allowed for any motorboat at a distance of 50 feet is 86 dBA. In Missouri, regulations are set to limit noise levels produced by motorboats in order to minimize disturbance to people and wildlife. The acceptable noise levels are typically designed to prevent excessive sound that could lead to complaints or disturbances in recreational areas.

Understanding these regulations is crucial for boat operators, as adhering to them helps ensure safety, compliance with local laws, and promotes a respectful boating environment. Noise pollution from motorboats can be particularly impactful on serene lakes and rivers, making these limits important for protecting the natural landscape and the experience of others in the area.

The other noise level options exceed the standards set for motorboats and would not be permissible, indicating a need for boat operators to be aware of and monitor their vessels’ sound output closely.