Question: a. Name three points defects in solid materials ( 3 marks) b. Calculate the equilibrium number of vacancies per cubic meter for copper at 1000C.

a. Name three points defects in solid materials ( 3 marks) b. Calculate the equilibrium number of vacancies per cubic meter for copper at 1000C. The energy for vacuncy formation is 0.9eV/ atom; the atomic weight and density (at 1000C ) for copper are 63.5g/mol and 8.4g/cm3, respectively. N1=6.0231023 atoms /mol and 1000C=1273K. ( 4 marks)

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