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Topic Content:

  • Meaning of Radiation
  • Infrared Radiation Absorption
  • Demonstration of Rate of Radiation by Different Surfaces
  • Applications of Radiation

Radiation is the process of heat transfer by which heat energy is exchanged between two surfaces obeying the law of electromagnetics.

This method of heat transfer does not require any material medium. This heat transfer takes place in the form of electromagnetic waves mainly in the infrared region. It also occurs through a vacuum or any transfer medium by means of photons.

Examples to demonstrate the transfer of heat by radiation

  • We feel warmer when we sit near a fire or hot object.
  • We feel how when we sit in the sun.
  • Slices of bread get heat from the heating coil in a toaster.

Infrared Radiation Absorption:

 

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