Aluminum square pin fins (k = 237 W/m•ºC) of 3-cm-long, 2 mm × 2 mm cross-section with a total number of 150 are attached to an 8-cm-long, 6-cm-wide surface. If the fin efficiency is 78 percent, the overall fin effectiveness for the surface is
(a) 3.4
(b) 4.2
(c) 5.5
(d) 6.7
(e) 8.4
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