ISRO Scientist or Engineer Mechanical 2010 Question 2

Question 2

The spectral emissive power $$E_1$$ ; for a diffusely emitting surface is $$E_1 = 0 for \lambda < 3\mu m; E_1 = 150 W/m^2 \mu m for 3 < \lambda < 12 \mu m; E_1 = 300W/m^2 \mu m for 12 < \lambda < 25 \mu m; E_1 = 0 for \lambda > 25 \mu m.$$ The total emissive power of the surface over the entire spectrum is



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