A cylindrical pin fin of diameter 0.6 cm and length of 3 cm with negligible heat loss

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A cylindrical pin fin of diameter 0.6 cm and length of 3 cm with negligible heat loss from the tip has an efficiency of 0.7. The effectiveness of this fin is
(a) 0.3

(b) 0.7

(c) 2

(d) 8

(e) 14

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