uses

• uses

  a

  A) microwaves

  B) bluetooth

  C) optic fiber

  D) direct broadcast satellite

  
• optic fibres

  a

  A) medicine

  B) communication

  
• uses of EM waves

  a

  A) radio waves

  B) microwaves

  C) infrared

  D) uv

  E) xray, gamma

  
• damage

  a

  A) microwave, infrared

  B) uv, xray, gamma

  
• Smoke alarm

  • Alpha:
  • highly ionising air
  • Alpha particles hit molecule, remove electrons
  • Not v penetrating
  • stopped by smoke (cant detect ionising -> alarm)
  • Safe: don't travel out of alarm bc short range
  • Halflife: 10-500 years
• Gamma

  • ionising radiation kill bacteria
  • Preserve food
• Measuring, controlling thickness

  • Absorption depend on thickness (Aluminium - B)
  • Lower amount of radiation detected if thickness too large. Detect crack
• Diagnosis, treat cancer

  • Gamma ray
  • Destroy cancer cells
  • Radiotherapy