Propagating Electro-Optic energy in the far infrared portion of the spectrum is dominated by _____ while the visible spectrum is dominated by _____.

The propagation of electro-optic energy involves different interactions depending on the region of the electromagnetic spectrum being considered. In the far infrared portion of the spectrum, emissivity plays a dominant role, as materials in this range typically emit energy, often related to thermal radiation. This means that emissivity, which is the ability of a surface to emit energy as thermal radiation, is the primary mechanism by which energy is propagated in the far infrared.

Conversely, in the visible spectrum, reflectivity becomes the dominant factor. Materials often reflect visible light rather than absorb or transmit it, depending on their surface properties and the nature of the incoming light. This reflects how surfaces interact with visible wavelengths differently compared to far infrared wavelengths, where energy is more commonly emitted rather than just reflected.

By understanding these fundamental differences in how materials interact with various portions of the electromagnetic spectrum, especially regarding the concepts of emissivity in the far infrared and reflectivity in the visible spectrum, one gains insight into the principles that govern the behavior of electro-optic energy across these ranges.