The hole density in silicon is given by p(x) = 1016 ex/Lp) (x0) where L = 2 10-4 cm. Assume the hole diffusion coefficient is D, = 8 cm/s. Determine the hole dif- fusion current density at (a) x = 0, (b) x = 2 x 104 cm, and (c) x = 10-3 cm.