Electromagnetic Wave

Card 1: Properties of Electromagnetic Wave

Properties of Electromagnetic Waves

  • Electromagnetic wave can travel in free space.
  • They travel in straight lines at a speed of approximately 300000 km/s.
  • They are electric, magnetic and transverse in nature.

  • Electromagnetic waves are electrically neutral.
  • Electromagnetic wave show characteristic of polarization.
Card 2: Polarisation of Transverse Wave

Polarisation of Transverse Wave

polarisation

  • A transverse wave can be polarized.
  • Plane polarized light will be produced when light travels through a polarizing material like polaroid.
  • Polaroid is a type of material that only allows light waves of one plane to pass through. This means that only a portion of the source light gets to pass through the polaroid.
Card 3: Radio Wave

Radio Wave

Source
Electrical oscillating circuit (consists of a capacitor and an conductor connected in series)

Application

  • Telecommunications
  • Broadcasting: Radio and
  • television transmission
  • Astronomy study
Card 4: Microwave

Microwave

Source
Oscillating electrical charge in a microwave transmitter

Application

  • Satellite transmissions
  • Radar systems to detect objects (size, form and position)
  • Cooking
Card 5: Infrared Radiation

Infrared Radiation

Source
Hot bodies, the sun and fires

Application

  • Night vision
  • Thermal imaging and physiotherapy
  • Remote controls for TV/VCR
  • Heating in physiotherapy
  • Thermometer
  • Cooking
Card 6: Visible Light

Visible Light

Source
The sun, hot objects, fires, light bulbs, fluorescent tubes

Application

  • Sight
  • Photosynthesis in plants
  • Photography
Card 7: Ultraviolet Light

Ultraviolet Light

Source
Very hot objects, the sun, mercury vapour lamps

Application

  • Identification of counterfeit notes
  • Production of fluorescent effects
  • Production of vitamin D in the skin
  • Sterilisation to destroy germs
  • Pest control
  • Disinfecting drinking water
Card 8: X-Ray

X-Ray

Source
X-ray tubes where high energy electrons bombarding a metal plate.

Application

  • Radiotherapy
  • Radiography (X-ray photograph)
  • Detection of cracks in building structures
  • Crystallography
Card 9: Gamma Ray

Gamma Ray

Source
Radioactive substances

Application

  • Cancer treatment
  • Sterilisation of equipment
  • Pest control in agriculture
Card 10: Empty Card

 

 

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