Measurement of thermal diffusivity in an unsteady=state experiment. A solid slab, 1.90 cm thick, is brought to thermal equilibrium in a constant-temperature bath at 20.0°C. At a given °instant (t = 0) the slab is clamped tightly between two thermos-tatted copper plates, the surfaces of which are carefully maintained at 40.0°C. The mid plane temperature of the slab is sensed as a function of time by means of a thermocouple. The experimental data are: 

Determine the thermal diffusivity and thermal conductivity of the slab, given that p = 1.50 g/cm³ and C_p = 0.365 cal/g ∙ C.

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t(sec) 0 T (C) 20.0 244 30.5 34.2 36.5 37.8 120 240 600 480 360