Question: a. Define the study of diffusion? ( 2 marks) b. At 300C the diffusion coefficient and activation energy for Cu in Si are D(300C)=7.81011 m2/s,Qd=41.5kJ/mol.

a. Define the study of diffusion? ( 2 marks) b. At 300C the diffusion coefficient and activation energy for Cu in Si are D(300C)=7.81011 m2/s,Qd=41.5kJ/mol. What is the diffusion coefficient at 350C ? ( 4 marks) c. Explain the different between ductile and brittle failure? ( 2 marks)

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