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What is True UV Light?

Published in Ultraviolet Radiation 2 mins read

True ultraviolet (UV) light is a form of electromagnetic radiation, specifically characterized by its wavelength.

Understanding UV Light

  • Definition: UV light is a type of electromagnetic radiation with wavelengths ranging from 10 to 400 nanometers.
  • Position in the Spectrum: It sits on the electromagnetic spectrum between visible light and X-rays. This means its wavelengths are shorter than those of visible light but longer than those of X-rays.

Key Characteristics

  • Wavelength: The defining characteristic of UV light is its wavelength, which falls within the 10–400 nm range.
  • Energy: Due to its shorter wavelength, UV light carries more energy than visible light.
  • Invisibility: UV light is invisible to the human eye; however, some insects, like bees, can see certain types of UV light.

Subcategories of UV Light

UV light is often divided into three subcategories:

  1. UVA (315-400 nm):

    • Longer wavelength UV light.
    • Reaches the Earth's surface in large quantities.
    • Contributes to tanning and skin aging.
  2. UVB (280-315 nm):

    • Medium wavelength UV light.
    • Mostly absorbed by the ozone layer.
    • Can cause sunburn and increase skin cancer risk.
  3. UVC (100-280 nm):

    • Shortest wavelength UV light.
    • Completely absorbed by the atmosphere.
    • Has germicidal properties (used for sterilization).

Practical Insights

  • Sunlight: The sun is the primary source of UV light.
  • Artificial Sources: UV light is also produced by artificial sources such as tanning beds, certain types of lamps, and lasers.
  • Applications: UV light has many applications, including sterilization, water purification, medical treatments, and scientific research.

Summary

Feature Description
Type Electromagnetic radiation
Wavelength Range 10-400 nanometers
Location Between visible light and X-rays
Visibility Invisible to human eyes
Energy Higher than visible light

In conclusion, UV light is electromagnetic radiation with wavelengths of 10–400 nanometers, positioned between visible light and X-rays.