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  • radio waves have the longest wavelengths they are used to broadcast many signals, including radio, television, and alarm systems
  • microwaves despite their name, microwaves are not the shortest EM waves. besides heating food, microwaves are used in cellular phones
  • infrared means below red. the amount of infrared light an object gives off depends on its temperature. below colors indicate different amounts of infrared light
  • visible light is all the colors of the EM spectrum we can see. it is the narrowest part of the EM spectrum
  • ultraviolet means beyond violet. same animals can see ultraviolet light
  • x rays can pass through most living tissue, but are absorbed by bones
  • gamma rays can be used to treat illnesses and in making medical images
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