ISRO Scientist or Engineer Mechanical 2009 Question 9

Question 9

The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surfaces (emissivily 0.9) maintained at 400 K and 300 K is (Stefan Bottzman constant $$\sigma = 5.67 \times 10^6 W/m^2 K^4$$)

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