EMS

• electromagnetic waves travel at the same speed through a vacuum
• em waves are transverse
• visible light is the only em wave our eyes can detect
• radio wave uses

  • broadcasting
  • communications
  • satellite transmission
• microwave uses

  • cooking
  • communications
  • satellite transmissions
• infrared uses

  • cooking
  • thermal imagering
  • short range communication
  • optical fibres
  • tv remotes
  • security systems
• visible uses

  • vision
  • photography
  • optic fibre communications
  • illuminations
• uv uses

  • disinfect water
  • phototherapy
  • sun tan
  • creating fluorescent effects
  • curing inks and resins
• x ray uses

  • medicine
  • airport security
• gamma uses

  • kill cancer (radiotherapy)
  • detect cancer
  • sterilize equipment
• gamma, x-ray and higher uv waves are ionising
• uv waves can cause skin cancer
• uv waves can damage eyes and cause burns
• microwaves can lead to the internal heating of body cells
• blue light can damage the retina
• gamma waves cause mutation and damage to cells