Conduction of Heat: Under Steady State Conditions, a Piece of Wood

Multiple Choice

Conduction of heat: Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides. The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28°C. Determine the thermal conductivity of this wood.

A) 9.2 × 10^-4 W/(m ∙ °C)
B) 270 W/(m ∙ °C)
C) 16 W/(m ∙ °C)
D) 0.061 W/(m ∙ °C)
E) 33 W/(m ∙ °C)