The spectral emissivity function of the zirconia and tungsten filaments are presented in Figure Q2(a). 1 1 0.8 82 Zirconia Tungsten 61 0.45 81 0.2 &3 82 0.10 1 4 0 0.4 0.7 2 4 2. (um) 0 2 1 (um) Figure Q2(a) Spectral emissivity function of zirconia and tungsten If both filament surfaces are maintained at 3000 K, determine 1) the average emissivity of zirconia and tungsten filaments. (11 marks) the total emissive power for zirconia and tungsten filaments and compare the answers obtained in the aspect of power consumption