Question: 3. A diffuse surface at 1000K has a hemispherical spectral emissivity that can be approximated by the solid line shown. (a) What is the hemispherical-total

3. A diffuse surface at 1000K has a hemispherical spectral emissivity that can be approximated by the solid line shown. (a) What is the hemispherical-total emissive power of the surface? What is the total intensity emitted in a direction 60 from the normal to the surface? (15%) (b) What percentage of the total emitted energy is in the wavelength range 5

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