What is the wavelength range of the UV spectrum?

The ultraviolet (UV) spectrum encompasses wavelengths between approximately 100 and 400 nanometers (nm). The division of the UV spectrum is typically categorized into three segments: UVA (long wave, 315-400 nm), UVB (medium wave, 280-315 nm), and UVC (short wave, 100-280 nm).

Option B, ranging from 180-400 nm, accurately reflects a broad segment of the UV spectrum that is significant for various applications, including industrial hygiene, because it includes both the UVB and UVA ranges. This section of the spectrum is essential to understand, particularly in the context of potential exposure and its effects on human health and the environment.

The other options do not align with the established boundaries of the UV spectrum. Choices that extend beyond 400 nm fall into the visible light range and therefore do not qualify as UV radiation. Consequently, recognizing the wavelength range of the UV spectrum is crucial for assessing risks associated with UV exposure in occupational settings.