A 1-cm-diameter, 30-cm-long fin made of aluminum (k = 237 W/m•ºC) is attached to a surface at 80ºC. The surface is exposed to ambient air at 22ºC with a heat transfer coefficient of 11 W/m2•ºC. If the fin can be assumed to be very long, its efficiency is
(a) 0.60
(b) 0.67
(c) 0.72
(d) 0.77
(e) 0.88
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