Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heating of building
Cooling of parts in furnace
Blast furnace
Heat received by a person from fireplace

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Heat and Mass Transfer
According of Kirchhoff's law

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Emissive power depends on temperature
Emissive power and absorptivity are constant for all bodies
Radiant heat is proportional to fourth power of absolute temperature

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