Final answer:
The tracer burnout is the point at which a tracer round stops emitting visible light. The burnout distance for a MK9 spotting round can vary depending on factors such as muzzle velocity and atmospheric conditions.
Step-by-step explanation:
The tracer burnout is a phenomenon that occurs when a tracer round, such as the MK9 spotting round, reaches a certain distance from the muzzle of the firearm and the tracer element stops emitting visible light.
Tracer rounds are used in military applications to visibly track the trajectory of bullets or shells.
The burnout distance for a MK9 spotting round can vary depending on factors such as muzzle velocity and atmospheric conditions.