short waves

short waves, radio waves whose frequencies range from about 3 to 25 megahertz (Mhz), corresponding roughly to the high-frequency band (see radio frequency). When they impinge on certain layers of the ionosphere, short waves are largely reflected back toward the earth. By one or more reflections between the earth and the ionosphere, a short-wave radio signal can be received at long distances from the transmitter.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on short waves from Fact Monster:

  • Wilhelm Conrad Roentgen - Roentgen or Röntgen, Wilhelm Conrad Roentgen or Röntgen, Wilhelm Conrad , ...
  • physical therapy - physical therapy physical therapy or physiotherapy,treatment of disorders of the muscles, bones, or ...
  • Marconi, Guglielmo, Marchese - Marconi, Guglielmo, Marchese Marconi, Guglielmo, Marchese , 1874–1937, Italian physicist, ...
  • radio frequency - radio frequency radio frequency, range of electromagnetic waves with a frequency or wavelength ...
  • Guglielmo Marconi - Biography of Guglielmo Marconi, Italian pioneer of wireless telegraphy

See more Encyclopedia articles on: Electrical Engineering