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The surface of a house hold radiator has...

The surface of a house hold radiator has an emissivity of 0.5 and an area of 1.5 `m^(2)`. The rate at which the radiation is emitted by then the radiator when its temperature is `47^(@)C` will be nearly (`sigma=5.7xx10^(-8)` Si units)

A

598 watt

B

299 watt

C

448 watt

D

346 watt

Text Solution

Verified by Experts

The correct Answer is:
C
`E=sigma A rhoT^(4)`
`=5.7xx1.5xx(1)/(2)xx1.5xx0.5xx[3.20xx10^(2)]`
`=5.7xx1.5xx(1)/(2)xx10.24xx10.24`
`=5.7xx0.75xx10.24xx10.24`
=448 watt.
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