Q.

An incandescent light bulb has a tungsten filament that is heated to a temperature 3×103K when an electric current passes through it. If the surface area of the filament is approximately10- 4m2 and it has an emissivity of 0.3, the power radiated by the bulb is nearlyσ=5.67×10−8W/m2−K4

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a

138 w

b

175 w

c

200 w

d

225 w

answer is A.

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Detailed Solution

P=eAσT4
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An incandescent light bulb has a tungsten filament that is heated to a temperature 3×103K when an electric current passes through it. If the surface area of the filament is approximately10- 4m2 and it has an emissivity of 0.3, the power radiated by the bulb is nearlyσ=5.67×10−8W/m2−K4