The spectral, directional emissivity of a diffuse material at \(2500 \mathrm{~K}\) has the following distribution:

Determine the total, hemispherical emissivity at \(2500 \mathrm{~K}\). Determine the emissive power over the spectral range 0.8 to \(2.5 \mu \mathrm{m}\) and for the directions \(0 \leq \theta \leq 15^{\circ}\).

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1.0 0 1.5 ()