Questions
The tungsten filament of an electric lamp has a surface area A and a power rating P. If the emissivity of the filament is e and is Stefan's constant, the steady temperature of the filament will be
detailed solution
Correct option is D
We know that the energy radiated per second per unit area at temp. T is given by =σeT4The power radiated from the filament of area A is given by P=σeT4×A∴ T=PAeσ1/4Talk to our academic expert!
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For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
radiating power will be :
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