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For flow of fluid over a heated plate, the following fluid properties are known viscosity = 0.001; specific heat at constant pressure = 1 kJ/kg. k; Thermal conductivity = 1 W/m.k The hydrodynamic boundary layer thickness at a specified location on the plate is 1 mm. The thermal boundary layer thickness at the same location is (A) 0.001 mm (B) 0.01 mm (C) 1 mm (D) 1000 mm