A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre?
A. 0.25
B. 0.5
C. 0.1
D. 0.01
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