Electromagnetic Waves

  • A wave from which travels at a constant speed of 300000000 m/s and is unaffected by electric or magnetic fields, such that it needs no material for its propagation is called electromagnetic wave.
  • Light waves are transverse electromagnetic waves.
  • Radio waves, television waves, microwaves, infra-red ray, visible light, ultraviolet rays, x-rays and gamma rays are major parts of electromagnetic spectrum in the order of decreasing wavelength or increasing frequency.
  • Radio waves, TV waves and micro-waves are produced by oscillating circuits in special vaccum tubes.
  • Infra-red rays, visible radiation and ultra-violet rays are produced by the excitation of outer electronic shell in increasing order.
  • X-rays are produced by the excitation of inner electrons of an atom and sudden destruction of high energy free electrons.
  • Gamma radiation are produced by the nucleus of an atom by the sudden destruction of high energy particles. They find use in the cure of cancer.
  • The regions of spectrum which do not excite retina and hence are not visible are collectively canned invisible spectrum. Infra-red and ultra-violet radiations are parts of it.
SEE ALL Add a note
YOU
Add your Comment




Recent Posts

About Us

Ekalawya, the online guru is there it help with its extensive base of most repeated questions and answers covering all areas of interest. We keep updating too, so that no major developments are lost from our current affairs scanner.
More
© Ekalawya | Built and hosted by Jyothis Joy




top
All rights reserved.
X
Skip to toolbar