Which statement is true about expert systems? a. expert systems can produce results from sources beyond the knowledge base. b. expert systems can find patterns in data and generalize rules for other data. c. expert systems can infer the knowledge based on cause and effect. d. expert systems retain their knowledge base permanently.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?