Under the conditions of Prob. 15.9:

(a) First determine the homogeneous nucleation rate when silver is supercooled by 20 degrees.
(b) Next determine the heterogeneous nucleation rate when silver is supercooled by 20 degrees.Use the data in Prob. 15.9 to determine I in nuclei per ?m2 per second; that is, express ?Nm interms of atoms per ?m2
(c) Discuss the difference between the heterogeneous and the homogeneous nucleation rates in terms of freezing at 20 degrees of supercooling.


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