EM spectrum

• Rude Men In Vegas Use Xray Glasses
• shortest F Rude -> radio longest wavelength

  | Men -> microwaves |

  | In -> infrared |

  | Vegas -> Visible light |

  | Use -> Ultra Violet |

  | Xray -> Xray |

  Longest F Glasses -> Gamma shortest wavelength
• Radio = listening to music/tv signals = no danger
• Microwaves = cooking, mobile phones = causes burns; it boils water
• Infrared = thermal imaging, night vision, cooking, internet = cause burns
• Visible light = to see = blindness
• UV = sunbeds, detect forged banknotes, gel nails = ionising
• xray = medical imaging, airport security = ionising
• Gamma = cures cancer, steralisation (if focus on one part) = ionising
• ionising = causes cancer
• Communications =

  radio (tv, music) needs an antenna or aerial

  Microwaves (phones) need satelites

  Infrared (internet) needs fibre optic cables
• wavelength decreases down the group
• frequency increases up the group