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The diffusion rate of A in B was studied at 5 0 0 deg C and 8 5 0 deg C . It

The diffusion rate of A in B was studied at 500\deg C and 850\deg C. It was reported that, for the same diffusion time, the depths of penetration x1 and x2 in the two experiments were in the ratio of 1: 4. Show that the activation energy of A in B is 57 kJ/mol.

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