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The filament of an evacuated light bulb ...

The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. then the power it radiates at `1727^(@)C` is [`sigma=5.67xx10^(-8)` SI units]

A

11.4 W

B

1140 W

C

114 W

D

`1.4xx10^(5)W`

Text Solution

Verified by Experts

The correct Answer is:
A
`P=sigmaArT^(4)`
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