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A thin square steel plate 10 cm on a sid...

A thin square steel plate 10 cm on a side is heated in a black smith's forge to temperature of `800^@C`. If the emissivity is 0.60, what is the total rate of radiation of energy ?

A

1402W

B

1503W

C

1603W

D

1703W

Text Solution

Verified by Experts

The correct Answer is:
B
The total surface area, including both sides is `2(0.1) m^(2) = 0.02 m^(2)`
According to Stefan Boltzmann law, `E= A e sigma T^(4)`
`:. E= (0.02m^(2)) (1) (5.67 xx 10^(-8) W m^(-2) K^(-4))(1073 K)^(4) = 1503W`
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