Electromagnetic waves – Electromagnetic spectrum

Oscillating electric and magnetic fields perpendicular to each other cause disturbances in space. These disturbances propagate in a direction perpendicular to both the electric and the magnetic fields and are called electromagnetic waves.

 

The electromagnetic spectrum is classified as

  • Gamma rays
  • X-rays
  • Ultra-violet rays
  • Visible light
  • Infra-red rays
  • Microwaves and
  • Radio waves

 

1888 – Hertz produced electro magnetic waves of wavelength about 6m.

 

1895 – J.C. Bose, an Indian scientist produced electromagnetic waves of wave length ranging from 5 mm to 25 mm.

 

1899 – G. Marconi was the first to transmit electromagnetic waves and establish wireless communication across the English Channel.

 

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One response to this post.

  1. Posted by senthil on August 17, 2011 at 12:50 pm

    Its very useful. But wwe need tamil version.tamil medium only to undersatand easily.

    Reply

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