Which statement is true regarding infrared light?

Infrared light is primarily associated with heat. This type of light lies just beyond the visible spectrum, and while it cannot be seen by the human eye, it can be felt as warmth. When infrared rays are absorbed by objects, they increase the vibrational energy of the molecules within those objects, which results in a sensation of heat. This property makes infrared light particularly useful in various applications, including heating devices, treatments in spas and salons for muscle relaxation, and even in night-vision technology.

The other statements do not accurately describe the characteristics of infrared light. For instance, it does not produce cold temperatures; rather, it is directly connected to heat generation. Furthermore, while ultraviolet light is responsible for causing sunburn, infrared light does not have the same effect on the skin. Lastly, infrared light is not visible to the naked eye, which is a critical aspect distinguishing it from other forms of light within the electromagnetic spectrum.