INTRODUCTION
- If the radiation energy is emitted by bodies because of their temperature it is known as thermal radiation.
- The mechanism of radiation is not a simple phenomenon and several theories are proposed to explain the propagation of radiation.
- According to Maxwell's theory, “Radiation is considered as electromagnetic waves, whereas Max Planck's concept treats radiation as photons or quanta of energy. However, both accepts are used to predict the emission and propagation of radiation”.
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