A pyrotechnic flare has which one of the following characteristics?

A pyrotechnic flare is designed to produce a bright light for signaling or illuminating purposes, and one of its notable characteristics is the peak emission in the infrared spectrum. Specifically, flares typically emit most of their energy in the range of 1-2 microns, which is near the infrared region. This infrared emission is effective at attracting attention and is a key feature that enhances visibility at night or in low-light conditions.

The emission range provided aligns with the behavior of pyrotechnic flares, as they typically generate a significant amount of heat and light, making them useful for various military and emergency signaling applications. The combination of visible light and infrared emissions allows them to be effective both to the naked eye and infrared detection systems. Thus, the characteristic of having a peak emission between 1-2 microns accurately describes one of the fundamental aspects of how pyrotechnic flares function.