Spectrum Facts



  • A spectrum is a range of different wavelengths of electromagnetic radiation.
  • The white light of sunlight can be broken up into its full spectrum of colors with a triangular block of glass called a prism. The prism is set in a dark room and lit only by a shaft of sunlight or similar white light.
  • The prism refracts (bends) short wavelengths of light more than longer wavelengths, so the light fans out in bands ranging from violet to red.
  • The order of colors in a spectrum is always the same: red, orange, yellow, green, blue, indigo, violet. Electricity, magnetism and radiation
  • Scientists remember the order of the colors with the first letter of each word in this ancient phrase: ‘Richard Of York Gained Battles In Vain.’
  • Infrared is red light made of waves that are too long for human eyes to see.
  • Ultraviolet is violet light made of waves that are too short for our eyes to see.
  • Spectroscopy, or spectral analysis, is the study of the spectrum created when a solid, liquid or gas glows.
  • Every substance produces its own unique spectrum, so spectroscopy helps to identify substances.
  • Spectral analysis can reveal what anything from a distant galaxy to a drug is made of.