The spectral intensity Ix associated with emission from a surface is found to depend on the zenith angle o and wavelength A as: Ix,e (), 0, 0) = exp(-(X - Amax)") cos(0), in which Amax is wavelength at which maximum emission occurs. Given the spectral intensity function, find: 1. The spectral emissive power Ex(X) of the surface. 2. The total emission power E of the surface