producing and absorbing em waves

• radiowaves

  • produced by oscillation in electrical circuits
  • when absorbed by conductors they create AC with a frequency of the radio wave
• Infared

  • produced by vibrations of atoms and molecules
  • when absorbed atoms vibrate more - substance heats up
• UV and visible light

  • emitted and absorbed when electrons change energy levels
  • emitting - goes down a level
  • absorbing - goes up a level
• gamma

  • by nuclear decay, fusion or fission