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What is the correct answer?
4
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10
-16
m
2
S
-1
and it is 1.94 × 10
-14
m
2
S
- 1
at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
A.
130
B.
180
C.
230
D.
250
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