What is the wavelength range of UVB light?

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Multiple Choice

What is the wavelength range of UVB light?

Explanation:
UV light is grouped by wavelength into three bands: UVC, UVB, and UVA. UVC is roughly 100–280 nm, UVB is roughly 280–320 nm, and UVA is roughly 320–400 nm (some sources tighten these boundaries a bit, but the order remains: UVB sits at the shorter end, UVA at the longer end). So UVB lies in the 280–320 nm range, not 320–400 nm. The 320–400 nm range is UVA. Therefore the UVB range is about 280–320 nm.

UV light is grouped by wavelength into three bands: UVC, UVB, and UVA. UVC is roughly 100–280 nm, UVB is roughly 280–320 nm, and UVA is roughly 320–400 nm (some sources tighten these boundaries a bit, but the order remains: UVB sits at the shorter end, UVA at the longer end). So UVB lies in the 280–320 nm range, not 320–400 nm. The 320–400 nm range is UVA. Therefore the UVB range is about 280–320 nm.

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