Wednesday, 14 September 2011

Electromagnatic Radiations or Eectromegnetic Waves

Nature of Radiations or Emitted by Electron

When we object moves up and down or vibrates continuously, energy, in the form of a wave, is sent or transmitted (or propagated) by the vibrating object to a distant place. The wave travels at right angle to the vibrating vibratory motion of the vibrating object and away from it. Wave produced by a vibrating object can be represented by a wavy curve. The tops (i.e. maximum) of the wavy curve are called crests and the bottoms (i.e. minima) are called troughs. When a stone is thrown in a pond of water, water molecules start to vibrate up and down and transmit their energy as waves on water surface which are seen traveling towards the bank of pond.



In 1864 James Clark Maxwell showed by that when an electrics current is passed through a circuit (i.e. through a tungsten filament), it radiates energy in the form of waves. The energy radiated is called radiate energy and the waves produced are called electromagnetic waves or electromagnetic radiations. These waves are so called because similar sort of  waves can also be obtained by moving a charged body as well as a magnet to and fro in am genetic field. These waves do not require any medium for propagation or transmission; e.g. light and radio waves (which are electromagnetic waves) from the sun and stars reach the earth by traveling through non-material medium i.e. through empty space. All these waves travel with the speed of light.

The radiations (or wave) emitted by the vibratory motion of an electron are also electromagnetic radiations. These radiations also travel with the speed of light.

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