The diffusion coefficients for carbon in nickel are given at two temperatures:

$T(C),D(\frac{m^2}{s})$

$600,5\mathrm{.}5{10}^{-14}$

$700,3\mathrm{.}9{10}^{-13}$

$($a$)$ Determine the value of $D_0.$

i

$\frac{m^2}{s}(Use$ scientific notation.$)$

$($b$)$ Determine the value of $Q_d.$

i

$k\frac{J}{m}ol$

$($c$)$ What is the magnitude of $D?$ at $880C.$

$\frac{m^2}{s}($Use scientific notation.$)$