Determine the total hemispherical emmisivity of a surface that has a spherical hemispherical emmisivity of 0.3 at wavelengths less than 1.5 um (micrometers), 0.6 from 1.5 um to 2.5 um, and 0.1 at wavelengths greater than 2.5 um. The surface temperature is 1000 degrees C.