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Q. |
A wall 50 mm thick (thermal conductivity k = 40 W/m?C) has temperature difference on two surfaces of 100?C. What could probably change if the temperature difference of this wall drops to 100?C |
A. | Thickness of wall reduces to 5 mm |
B. | Thickness of wall increases to 500 mm |
C. | Thermal conductivity changes to 400 W/?C |
D. | Rate of heat flow drops to one tenth of the original |
E. | Area of heat transfer increases 10 times |
Answer» D. Rate of heat flow drops to one tenth of the original |
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