The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 10-16 m2S-1 and it is 1.94 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
A. 230
B. 180
C. 130
D. 250
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