What is the key feature of visible light?

Our eyes are able to detect those wavelengths of electromagnetic radiation, which allows us to see.

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Does visible light or ultraviolet radiation have longer wavelengths?

Visible light has longer wavelengths.

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What are the 7 colours of visible light, starting with the longest wavelength?

The acronym ROYGBIV can be used to remember the order of wavelengths in visible light, from longest to shortest wavelength:


(longest) Red, Orange, Yellow, Green, Blue, Indigo, Violet (shortest)

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Give 2 uses of visible light.

1Cameras.


2Optical fibres.

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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.

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Give 4 uses of ultraviolet radiation.

  1. Fluorescent lights.
  2. Checking for 'invisible' markings in things like passports.
  3. Destroying microorganisms to sterilise water.
  4. Tanning beds to get a suntan.

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What is fluorescence?

Fluorescence is the phenomenon of ultraviolet light energy being absorbed and then re-emitted as visible light.

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