EM waves

• Order of EM waves

  1. Radio waves
  2. Microwaves
  3. Infrared radiation
  4. Visible light
  5. Ultraviolet
  6. X-rays
  7. Gamma rays
• What type of objects absorb/emit the best?

  Dark Matte
• What type of objects absorb/emit the worst?

  Light Shiny
• Absorbs more radiation than emits = hotter
• Emits more radiation than absorbs = colder
• High frequency = high energy
• How are radio and microwaves made?

  Using circuits
• How is infrared radiation made?

  By all objects with a temperature
• How is visible light made?

  Electrons changing energy levels on atoms
• What are the three ionising radiation?

  • Ultraviolet
  • X-rays
  • Gamma rays
• How is ionising radiation made?

  Electrons changing energy levels
• Uses for radio waves

  Communication
• Uses for microwaves

  • Wi-Fi
  • Microwaves
• Uses for infrared radiation

  • Remotes
  • Heating
  • Thermal images
  • Cameras
• Uses for visible light

  • Fibreoptic cables
  • Seeing
  • Lasers
• Uses for ultraviolet waves

  • Sterilising equipment
  • Fluorescent materials
• Uses for X-rays

  It is absorbed by the bone and not by the skin therefore it is good for medical images
• Uses for gamma rays

  • Radiotherapy
  • Sterilise equipment
• Disadvantages to using ionising radiation

  Can damage cells and cause cancer
• Why do nurses wear lead-lined aprons when performing x-rays

  Lead absorbs x-rays preventing then from causing damage
• Which EM waves has the longest wavelength?

  Radio waves
• Which EM wave has the Shortest wavelength?

  Gamma rays
• Which EM wave has the highest frequency?

  Gamma rays
• Which EM wave has the lowest frequency?

  Radio waves