In the process of testing heat-resistant steel panels, a panel with a thickness of 5 cm with a temperature of 25oC is heat treated at 250oC. The thermal diffusivity of the panel is 0.97.10-5 m2/s. a) Determine the surface temperature of the panel after 20 seconds of heat treatment is given b) What is the temperature of the center of the panel after 20 seconds of heat treatment is applied c) Make a graph of the change in the surface temperature of the panel during the testing process