Q. 1 Determine the indices for the directions (green and blue) shown in the accompanying figure [2] Q. 2 Determine the composition, in weight percent, of an alloy that consists of 85 at % zinc and 15 at\% copper? [1.5] Q. 3 Calculate the equilibrium number of vacancies per cubic meter for aluminum at 500C. The energy for vacancy formation is 0.75eV/ atom; The atomic weight and density (at 500C ) for aluminum are, respectively, 26.98g/mol and 2.62g/cm3. [1.5]