A blackbody is at a temperature of 1200 K, and is in air. 50 (a) What is the spectral intensity emitted in a direction normal to the black surface at =47im? (b) What is the spectral intensity emitted at 0 = 45 with respect to the normal of the black surface at = 4 m? (c) What is the directional spectral emissive power from the black surface at 0450 and 4 m?" = (d) At what is the maximum spectral intensity emitted from this blackbody, and what is the value of this intensity? (e) What is the hemispherical total emissive power of the blackbody?