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A electric heater is placed inside a roo...

A electric heater is placed inside a room of total wall area `137m^(2)` and maintained at a temperature `20^(@)C` inside, outside temperature `-10^(@)C`. The walls are made up of three composite materials. The innermost layer is made up of wood of thickness 2.5 cm, the middle layer is of cement of thickness 1 cm and the exterior layer is 25 cm thick. Assuming there is no loss of heat through any other way, the power of the electric heater is (the thermal conductivity of wood, cement and brick are `"0.125 W m"^(2)""^(@)C^(-1),1.5Wm^(-2)""^(@)C^(-1) and 1Wm^(-2)""^(@)C^(-1)` respectively)

A

9000 W

B

8500 W

C

8800 W

D

9400 W

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The correct Answer is:
A
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