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Question: in an experiment to determine conductivity of materials rods of...

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In an experiment to determine conductivity of materials, rods of different materials extend from a vessel containing boiling water, and the rods are coated with a thin layer of wax and the length up to which the wax melts is used to determine the conductivity of materials. The melting point of wax is 40°C, the base temperature is 99°C, the diameter of rods is 8 mm. The length of rods are 60 mm, determine the length upto which wax will melt if the rod is of copper with k = 330 W/mK. The surroundings are at 25°C and the convection coefficient is 20 W/m2K. State whether the length of melt in the case of Aluminium rod will be longer or shorter and justify your answer.

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