Infrared (IR) systems operate at a band of frequencies _____.

Infrared (IR) systems indeed operate at frequencies that are classified as above radio frequencies (RF) and below visible light. This range typically spans from about 300 GHz to 400 THz. The IR spectrum is divided into various sub-regions: near-infrared, mid-infrared, and far-infrared, all of which lie above the radio frequency bands often utilized in wireless communication, and just below the start of visible light, which begins around 400 THz.

This range of operation makes infrared suitable for various applications including remote controls, optical fiber communications, and infrared imaging systems. Understanding the position of IR frequencies in the electromagnetic spectrum is crucial for recognizing how different communication technologies can interact and the benefits they provide based on their operating frequencies.