The filament of a bulb has an area 5xx10^(-5)m^(2) and is at 2000 K. If its relative emittance is 0.85 and sigma=5.7xx10^(-8) MKS units, what the energy radiated in one minuts :

The filament of a bulb has an area 5xx10^(-5)m^(2) and is at 2000 K. I

1.	The filament of a bulb has an area 5xx10^(-5)m^(2) and is at 2000 K. If its relative emittance is 0.85 and sigma=5.7xx10^(-8) MKS units, what the energy radiated in one minuts :
Answer» 2336 J `232.6` J `23.26` J None of the above Solution :`E=eAsigmaT^(4)t=0.85xx5xx10^(-5)XX5*7XX10^(-8)(2000)^(4)xx60`. `=2360J`. THUS correct choice is (a).

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The filament of a bulb has an area 5xx10^(-5)m^(2) and is at 2000 K. If its relative emittance is 0.85 and sigma=5.7xx10^(-8) MKS units, what the energy radiated in one minuts :

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