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2: Overview
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Ultraviolet A
Ultraviolet A
Wavelength: 0.34-0.4 micrometers, the size of a small bacteria
Energy per photon: 4 electron volts
Harmful Effects: In high doses may contribute to skin cancer or eye damage.

Emitted by:

  • Black light bulbs
  • Tanning lamps in small amounts
  • Light bulbs
  • UV lamps for rock and mineral identification

Detected by:

  • Flying insects, such as houseflies
  • Black and white film
  • Fluorescent paints are used to convert ultraviolet light to visible colors


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