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A body which has a surface area 2.00 $c m^{2}$ and a temperature of 727 ${}^{0}C$ radiates energy at the rate of 5 W. Its emissivity is(Stefan Boltzman constant 5.67 x $10^{- 8} W m^{- 2} K^{- 4}$

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0.14

0.44

0.34

0.24

answer is B.

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Detailed Solution

$P = e σ A T^{4} e = \frac{P}{σ A T^{4}} h e r e T = 1000 K A = 2 x 10^{- 4} m^{2} a n d σ = 5.67 x 10^{- 8} w m^{- 2} K^{4} s u b s t i t u t i n g w e g e t e = 0.44$

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