Consider a black surface at 4040F. Determine the radiation energy emitted by the black surface per unit area (in Btu/h-ft) for A 4 m. Use the Blackbody radiation functions table. Given: Stefan-Boltzmann constant (0) = 0.1714 10-8 Btu/h-ft.R4 The radiation energy emitted by the black surface per unit area, Eb, A1- (7) = Btu/h-ft