The diffusion coefficients for silver in copper are given at two temperatures:

T($$^\circ$$) D($$m^2/s)$$
650 5.5x$$10^{-16}$$
900 1.3x$$10^{-13}$$

(a)Determine the values of $$D_{0}$$ and the activation energy $$Q_{d}$$.
(b)What is the magnitude of D at 1100$$^\circ$$ (1373K)?