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Radiation-:-Processes-and-Properties

A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at rate of 2 W. If heat transfer coefficient on both surfaces of plate is stated to be 87.5 W/m 2 K, workout energy lost by reflection


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

When a surface absorbs a certain fixed percentage of striking radiation the surface is called

A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at rate of 2 W. If heat transfer coefficient on both surfaces of plate is stated to be 87.5 W/m 2 K, workout energy lost by reflection

The value of reflectivity depends upon
(i) Body temperature
(ii) Wavelength of reflected radiation
(iii) Nature of surface of body
Identify the correct statement

A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at the rate of 2 W. If heat transfer coefficient on both surfaces of the plate is stated to be 87.5 W/m 2 K

workout the energy lost by reflection

Radiation : Processes and Properties

Heat-Transfer