14.) Vacancy diffusion is usually slower than that of interstitial diffusion. This is because: a) Number of interstitial sites is greater than vacancies b) Vacancy diffusion requires more energy than...

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Extracted text: 14.) Vacancy diffusion is usually slower than that of interstitial diffusion. This is because: a) Number of interstitial sites is greater than vacancies b) Vacancy diffusion requires more energy than interstitial diffusion c) Interstitial species are smaller than substitution species d) All of the mentioned