An infinite plate having a thickness of 2.5 cm is initially at a temperature of 150C, and

An infinite plate having a thickness of 2.5 cm is initially at a temperature of 150ºC, and the surface temperature is suddenly lowered to 30ºC. The thermal diffusivity of the material is 1.8 × 10−6 m2/s. Calculate the center-plate temperature after 1 min by summing the first four nonzero terms of Equation (4-3). Check the answer using the Heisler charts.