A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal

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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.

Options:

A . 0.01

B . 0.1

C . 0.25

D . 0.5

Answer: Option B

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