A 10-cm high and 20-cm wide circuit board houses on its surface 100 closely spaced chips, each generating heat at a rate of 0.12 W and transferring it by convection and radiation to the surrounding medium at 40°C. Heat transfer from the back surface of the board is negligible. If the combined convection and radiation heat transfer coefficient on the surface of the board is 22 W/m2•°C, the average surface temperature of the chips is
(a) 41°C
(b) 54°C
(c) 67°C
(d) 76°C
(e) 82°C
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