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The filament of a bulb has an area 5xx10...

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 :

A

2336 J

B

`232.6` J

C

`23.26` J

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
A
`E=eAsigmaT^(4)t=0.85xx5xx10^(-5)xx5*7xx10^(-8)(2000)^(4)xx60`.
`=2360J`.
Thus correct choice is (a).
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