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The amount of radiation mainly depends upon the

  • Thermal radiation is the electromagnetic radiation emitted by a body with a temperature above absolute zero.
  • The amount of energy emitted depends on the temperature of the surface and its ability to emit energy.
  • Thermal radiation can have a wavelength varying from 0.1 to 100 µm and the wavelength of emission depends upon the nature, temperature, and state of the emitting surface.
  • The emission of radiation in gases depends upon the thickness of the gas layer and the pressure of the gas.