The element of an electric fire with an output of 1.5kw is a cylinder 0.3m long and 0.04 in radius calculate temperature if it behave as black body
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Solution,
Power (P) =1.5 Kw=1500w
Length of cylinder (l)=0.3m
Radius of the cylinder (r)= 0.04m
Area of the cylinder= 2πrl=2∗22/7∗0.04∗0.3=0.075m^2
From the Stefan’s law
P = σ A T4
T^4=P/σA=15005./.(7∗10−8∗0.075 )
T^4= 3.5* 1012
∴ T =(3.5* 10^12)^1/4
Explanation:
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