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4.9 The Stefan-Boltzmann law can be employed to estimate the rate of radiation of energy H from a surface, as in H=AeT4 where H is in watts, A= the surface area (m2),e= the emissivity that characterizes the emitting properties of the surface (dimensionless), = a universal constant called the Stefan-Boltzmann constant (=5.67108Wm2K4), and T= absolute temperature (K). Determine the error of H for a steel plate with A=0.15m2, e=0.90, and T=65020. Compare your results with the exact error. Repeat the computation but with T=65040. Interpret your results. 4.10 Repeat Prob. 4.9 but for a copper sphere with radius =0.150.01m,e=0.900.05, and T=55020