Air at 20 degree Celsius flows over a flat surface maintained at 80 degree Celsius. The local heat flow at a point was measured as 1250 W/m2 .Take thermal conductivity of air as 0.028 W/m K, calculate the temperature at a distance 0.5 mm from the surface

Air at 20 degree Celsius flows over a flat surface maintained at 80 de

1.	Air at 20 degree Celsius flows over a flat surface maintained at 80 degree Celsius. The local heat flow at a point was measured as 1250 W/m2 .Take thermal conductivity of air as 0.028 W/m K, calculate the temperature at a distance 0.5 mm from the surface
A.	57.682 degree celsius
B.	67.682 degree celsius
C.	77.682 degree celsius
D.	87.682 degree celsius
Answer» B. 67.682 degree celsius