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2. A test setup is designed to determine thermal conductivity of materials experimentally. This setup consists of a well-insulated large reservoir filled with 79kg of molten salt which has a specific heat of 1560 J/kg and at 500 °K. Heat loss is only allowed through a 0.2m thick stainless steel block and a fin with adiabatic end attached to it which is machined from the test material. The contact resistance between stainless steel block and fin is negligible. The freestream temperature and convection coefficient of air flow are 300K and 100 W/m²K respectively. Find the test fin material if time rate of change of temperature occur to be 0.001 °C/s on the reservoir. The fin thickness, width and length are 0.002m, 0.08m and 0.1m respectively. Properties: ksteel=14W/mK, kaluminum-180W/mK, kcopper=398W/mK