Which example represents steady-state noise?

The example that represents steady-state noise is a C-130 cargo plane. Steady-state noise is characterized by a consistent and stable level of sound over time, which means that it does not fluctuate significantly. The noise produced by a C-130 cargo plane during flight is relatively constant while it is in operation.

In contrast, gunfire, thunder, and loud music are typically categorized as non-steady-state noises. Gunfire and thunder are characterized by sharp, transient sounds that occur intermittently, while loud music can vary in volume and intensity depending on the performance or recording being played. Therefore, the C-130 cargo plane is the best representation of steady-state noise due to its persistent and uniform sound during its operation.