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

• A. – 1052.4 degree celsius
• B. – 2052.4 degree celsius
• C. – 3052.4 degree celsius
• D. – 4052.4 degree celsius