t1s03 - Home Introduction Policies Resources Requirements...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Test 1 Spring 03 hu+kv+lw=0
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Cv=exp(- Gv/kT) D=Do exp(-Q/kT)= Do exp(-Q/RT), R=2 cals/mole l= 2d sin q N=2 (n-1) Q1. Using the same coordinate system and the same position of the origin determine the Mil plane ABC and the direction PQ in the unit cell below. AQ is (3/4) along the face diagonal. A following questions. 1. The origin should be chosen a. at P b. at A c. corner above A 2. The intercepts that the plane makes with the axes chosen parallel to the dashed lines are a. a/2,a/2,0 b. -a/2,a/2,-a c. a/2,a/2,a 3. Miller indices of the plane, with the negative sign taken as a bar, are a. (110) b. (-2 2 -1) c. (221) 4. For the direction PQ with the same origin and same coordinate system chosen above, the i the coordinates a. -1,1,0 b. 1,1,-1 c. -1,-1,0 5. The coordinate of the final point are a. 3/4,3/4, 0 b. -3/4,3/4,0 c. -3/4,3/4,-1 6. Miller indices of the direction PQ, with the negative sign taken as a bar, are a. [1-1-4] b. [114] c. [174] 7. The indices of the normal to the plane ABC, with the negative sign taken as a bar, are a. [221] b. [-22-1] c. [111] 8. Is the direction contained in the plane a. yes b.no Q2. Iron takes up body centered unit cell at room temperature. The size of the unit cell is 0.2 diffraction is carried out with copper radiation of wave length 0.154 nm. Answer the followi 1. The hkl reflection that appears first in the diffraction pattern from iron is
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a. (111) b. (110) c. (200) 2. The Bragg angle in degrees at which the diffraction peak appears is a. 22.3 b. 27.7 c. 32.5 3. The number of atoms per unit cell in the iron lattice are a. 1 b. 4 c. 2 4. The iron atoms touch each other along a. cube edge b. body diagonal c. face diagonal 5. The size of the iron atom in nanometers in body centered cubic structure is a. 0.124 b. 0.101 c. 0.144 6. If Avogadro number is 6.03x10 23 and if the atomic weight of iron is 55.85, density of iron a. 7.84 b. 15.7 c. 3.91 7. If thermal expansion coefficient of bcc iron is 11.0x10 -6 nm/nm.degree, upon increasing t from 300 to 910oC the size of the unit cell of iron is expected to change to
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t1s03 - Home Introduction Policies Resources Requirements...

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