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.



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.


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