UV light

• Key feature of visible light

  Our eyes are able to detect those wavelengths of electromagnetic radiation, which allows us to see
• Does visible light or ultraviolet radiation have longer wavelengths

  Visible light has longer wavelengths
• 7 colours of visible light (longest wavelength to shortest)

  Red

  Orange

  Yellow

  Green

  Blue

  Indigo

  Violet
• 2 uses of visible light

  Cameras

  Optical fibres
• How can ultraviolet radiation be harmful

  It can ionise atoms inside our cells causing damage. This can lead to sun burn, and in some cases can lead to cancer.
• 4 uses of ultraviolet radiation

  Fluorescent lights

  Checking for ‘invisible‘ markings in the things like passports

  Destroying microorganisms to sterilise water

  Tanning beds to get a suntan
• Fluorescence

  The phenomenon of ultraviolet light energy being absorbed and then re-emitted as visible light