EM Waves

• Red - Radiowaves

  Martians - Microwaves

  Invaded - Infrared Radiation

  Venus - Visible Light

  Using - Ultraviolet Light

  X-ray - X-rays

  Guns - Gamma rays
• Beginning of the spectrum have the longest waves but the lowest frequency and energy. End of the spectrum has the shortest waves but the highest frequency and energy
• Electromagnetic Waves - electric and magnetic disturbances that can be used to transfer energy from a source to an observer
• Speed of all electromagnetic waves in space is 3x10^8 m/s
• Radiowaves -

  Uses:

  • television, radio, phones as they can carry the most information

  Dangers:

  • may penetrate people's bodies, heat the inside and cause damage
• Microwaves -

  Uses:

  • satellite communication
  • can pass through the atmosphere and connect to satellites

  Dangers:

  • penetrate people's bodies, heat the inside, cause damage
• Infrared Radiation -

  Uses:

  • electrical heaters, cooking food, remote controls and infrared cameras
  • fibre optic communications

  Dangers:

  • absorbed by the skin and can cause burns and kill skin cells
• Visible Light -

  Uses:

  • cameras, fibre optic communications

  Dangers:

  • can damage the eyes
• Ultraviolet -

  Uses:

  • energy efficient lamps and sun tanning beds

  Dangers:

  • can cause blindness
  • cause the skin to age prematurely, increasing risk of skin cancer
• X-rays -

  Uses:

  • medical imaging
  • treatment to kill cancer cells and bacteria

  Dangers:

  • can mutate genes, causing cancer
• Gamma Rays -

  Uses:

  • medical imaging and treatments
  • kill harmful bacteria and cancer cells

  Dangers:

  • can mutate genes, causing cancers