The spectral, directional emissivity of a diffuse material at $2500K$ has the following distribution:

Determine the total, hemispherical emissivity at $2500K.$ Determine the emissive power, in $k\frac{W}{m^2},$ over the spectral range $0\mathrm{.}8$ to $2\mathrm{.}5m$ and for the directions $015.$

$(T)=,$

$E=,k\frac{W}{m^2}$