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(a) Calculate the size (radius) of the critically sized nucleus for pure platinum when homogeneous nucleation takes place using the following equation. AH, AT where

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(a) Calculate the size (radius) of the critically sized nucleus for pure platinum when homogeneous nucleation takes place using the following equation. AH, AT where y = 240x10"? J/cm?, AH, =-2160J/cm', T. = 2045 K and assume the undercooling AT = 0.21 0.2(2045 K) = 409 K. (Please see the results in the nm-scale and imagine the typical size of nucleating sites) (b) Describe the correlation of the critical radius and either embryo dissolution or nucleus growth

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