Position in the Electromagnetic Spectrum The electromagnetic spectrum arranges all types of radiation by wavelength and energy. The shortest and most energetic category is UV-C, which covers wavelengths from 100 to 280 nanometers and is almost entirely absorbed by the Earth's atmosphere.
Using Scientific Tools to Measure Invisible Light
Interaction with Biological Matter When ultraviolet light encounters biological tissue, it carries enough energy to break chemical bonds in molecules. Detection and Measurement Because ultraviolet light is invisible to humans, scientists rely on specialized instruments to detect and measure it.
Visible light occupies a narrow band in the middle, with colors ranging from red, which has the longest wavelength, to violet, which has the shortest. Devices like UV sensors and photomultiplier tubes convert UV photons into electrical signals that can be quantified.
Using Scientific Tools to Measure Invisible Light
The body responds to this damage by increasing melanin production, which acts as a natural defense against further UV injury. This classification places UV light between visible violet light and X-rays, giving it properties that are distinct from both ordinary light and more penetrating radiation like gamma rays.
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