1.1 The diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m2 degree and radiation factor is 0.9 Radiation Surroundings at T=335 K ↑ 325 K a) 1052.4 degree celsius b) 2052.4 degree celsius - c) 3052.4 degree celsius d) 4052.4 degree Celsius