the following are solutions to the diffusion equation expadt - er co specify the best solution for each of the following examples and explain your choice a thin sheet of steel (thickness 0.8 mm) with a high carbon concentra- tion is annealed in a carbon-free gas environment for 2 weeks. the dif- fusion coefficient of c in steel is 10-7 cm2/s a) b) agas containing a dopant is passed over a si wafer with thicknes: s 0.1 cm for 30 minutes. the dopant diffusion coefficient is 10-10 cm2/s a thin film of radioactive fe is deposited on the and of a 40 mm long fe cylinder and annealed at high temperature temperature for 60 minutes the diffusion coefficient of fe at this temperature is 10-9 cm2/s c)