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Radiation-:-Processes-and-Properties

A metal sphere of surface area 0.0225 m2 is in an evacuated enclosure whose walls are held at a very low temperature. Electric current is passed through resistors embedded in sphere causing electrical energy to be dissipated at rate of 75 W. If sphere surfaces temperature is measured to be 560 K, while in steady state, calculate emissivity of sphere surface


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This Chapter Radiation-:-Processes-and-Properties consists of the following topics

A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the monochromatic radiant flux density at 1 micron m wavelength

A metal sphere of surface area 0.0225 m2 is in an evacuated enclosure whose walls are held at a very low temperature. Electric current is passed through resistors embedded in sphere causing electrical energy to be dissipated at rate of 75 W. If sphere surfaces temperature is measured to be 560 K, while in steady state, calculate emissivity of sphere surface

According to Stefan-Boltzmann law of thermal radiation

A metal sphere of surface area 0.0225 m2 is in an evacuated enclosure whose walls are held at a very low temperature. Electric current is passed through resistors embedded in the sphere causing electrical energy to be dissipated at the rate of 75 W. If the sphere surfaces temperature is measured to be 560 K

while in steady state

calculate emissivity of the sphere surface

Radiation : Processes and Properties

Heat-Transfer