Light is a form of radiant energy. Various forms of incandescent bodies are the sources of light and the light emitted by such bodies depend upon the temperature of bodies.
Heat energy is radiated into the medium by a body which is hotter than the medium surrounding it. The heat of the body, as seen can be classified as red-hot or white-hot.
While the body is red-hot, the wavelength of radiated energy will be sufficiently large and the energy available is in the form of heat.
When the temperature increases, the body changes from red-hot to white-hot state.
The wavelength of the energy radiated becomes smaller and enters into the range of the wavelength of light. Actually the hot bodies emit heat as well as light energy. The velocity of these being equal to 3 x 108 m/s.
The light waves have wavelengths varying from 0.00075 mm to 0.0004 mm.
The wavelength of light is usually expressed in Angstrom. 1 Angstrom being equal to 10-10 meter.
The ratio of the energy emitted by the body in the form of light to the total energy emitted by the body is known as “radiant-efficiency”.
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