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i) Fick's first law is J=DxC. Define each of the symbols. (5) ii) Fick's second law is tC=Dx22C and has a solution CsC0CxC0=1erf(2Dtx). Define each of the symbols. What is the definition of steady-state diffusion? (5) iii) The diffusion coefficient at temperature T is given by D=D0exp(RTQd). Please define each term in this expression. Sketch an Arrhenius Plot (ln(D) vs 1/T) showing how the expected behavior of substitutional diffusion differs from that of interstitial diffusion