In what range does the electromagnetic spectrum contain UV energy?

The range of the electromagnetic spectrum that contains ultraviolet (UV) energy is indeed between 200 to 400 nanometers (nm). This range is crucial for understanding the different effects UV radiation has on matter, including biological organisms, which can lead to skin damage and other types of injury from overexposure.

The UV spectrum is generally divided into three categories: UVA (320-400 nm), UVB (280-320 nm), and UVC (100-280 nm). This spectrum is important in various fields, including health, environmental science, and materials science, as it has significant implications in areas such as tanning, UV sterilization, and the degradation of materials.

The ranges listed in the other options do not fall within the defined range for UV energy. The first option (100 to 200 nm) pertains to the UVC range, which is often less discussed in everyday contexts but is crucial for germicidal applications. The third option (400 to 600 nm) includes visible light rather than UV, and the last option (600 to 800 nm) corresponds to the infrared range, which is outside of the UV spectrum. Understanding these distinctions helps clarify the specific characteristics and applications of different regions of the electromagnetic spectrum.