test1sum03

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Home Introduction Policies Requirements & Grading Resources Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact Test 1Sum 03 MSE 200 Test#1 Read the questions carefully and answer on the backside also. C v =exp(-G v /kT),J=-D(dC/dx), D=Do.exp(-Q/kT), Q1. Determine the Miller indices of the atomic plane and the atomic direction (AB) shown in Figures below. Answer the following questions.

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Use Figure (b) for the following: 1. From Figure (b) the origin should be chosen at a.left hand bottom back corner .... b. right hand back top corner c. right hand top front corner .............. (c ) 2. The intercepts that the plane makes with the above chosen origin are a. -1,-2, -1, .............. b. 1/2,1,1/3 ........ c. -1,-3/2,-1 ........... ( a) 3. Miller indices are a. (212) ............ b. (213) ............ c. (323) ........... ( a) Use Figure (a) for the following: 4. With respect to the origin at A and the horizontal axis as x -axis, the coordinates of B are a. 1,0,-1 .......... b. -1,0,1 .......... c. 1,1,0 .......... (b) 5. The Miller indices of direction AB with a minus for a bar in front are a. [10-1] ....... b. [-101] ............ c. [110] ............ (b ) Q2.. Draw the crystallographic plane with Miller indices (-111) and the direction [110]. 1. Draw the atomic plane in the cube below.
2. Draw the atomic direction in the cube above. 3. Is the direction contained in the plane. a. yes .... b. no ...... (a) Q3. 1. In the interatomic force vs interatomic distance of separation for a strong solid and a weak solid shown below, identify the strong and week solids. 2. In the potential energy vs interatomis distance of separation show below, identify the cohesive energy and equilibrium distance of separation.

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Q4. X-ray diffraction of iron powder was taken using Cu Ka raduation with wave length l=0.154 nm. If the lattice parameter of iron is 0.286 nm, Give first Bragg angles at which X-ray peak will be observed. Rules for observing X-ray peaks are fcc: h,k,l either all odd or all even bcc: h+k+l is even 1. The first peak that will appear in the diffraction pattern of iron is a. 100 .......... b.111 ............. c. 110 ............. (c )
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