A pipe (i.d. = 52 mm, o.d. = 60 mm) has eight rectangular fins welded to the outer surface. The fins are of 5 cm length and 1.6 mm thickness. The wall temperature of the pipe is 160 oC while the ambient temperature is 25 oC. The finned tube losses heat to a flowing stream of air with a surface heat transfer coefficient of 115 W/m2/ oC. The thermal conductivity of the fin material is 46 W/m/ oC. Neglecting heat transfer from the edges of the fins, calculate (a) the fin efficiency, and (b) the rate of heat transfer to the air per meter length of the finned pipe.