The diffusion co-efficient of Ni in Cu at 1000K is 1.93 × 10-16m2.s-1 & it is 1.94 × 10-14 m2.s-1 at 1200K. The activation energy (in KJ.mol-1) for the diffusion of Ni in Cu, is
A. 130
B. 180
C. 230
D. 250
Answer: Option C
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