Meen 222- Quiz 2

Meen 222- Quiz 2 - (R of 0.1363 nm and the atomic weight of...

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Auguste Bravais (1811–1863) was a French physicist. He pointed out in 1845, that there are 14 unique Bravais lattices in three dimensions crystalline systems, adjusting the previously existent result (15 lattices) by Frankheim, obtained three years before. Bravais also studied magnetism, the northern lights, meteorology, botanical geography, astronomy, and hydrography. MEEN 222 – 503 Fall 2008 Quiz #2 Student: _________________________________________________________ Print First and Last Name
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1. (5 points) Determine the indices for the directions and planes shown in following unit cells: [110] (211) [1123] (1122) 2. (5 points) Molybdenum has BCC crystal structure, an atomic radius
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Unformatted text preview: (R) of 0.1363 nm, and the atomic weight of 95.94 g/mol. Compute its theoretical density. Note - Sketch BCC structure and mark all relevant lengths. Diagonal of the cube: 3 a D = a=length of the cube’s edge Diagonal of the square: 2 a d = a=length of the cube’s side 1 nm = 10-9 m, 1 m = 10 2 cm N A =6.23 x 10 23 atom/mol 1/2 a a a a a a z z z z x x y y x’ y’ 1 point for equation D=4R D 2 = a 2 + a 2 + a 2 = 4R a=4R/ 3 D a 1 point figure 1 point for calculating V 1 point for units 1 point plugging numbers and correct 1 point 1 point 1 point 1 point 1 point for calculation...
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This note was uploaded on 07/28/2010 for the course MEEN 222 taught by Professor Radovic during the Fall '08 term at Texas A&M.

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Meen 222- Quiz 2 - (R of 0.1363 nm and the atomic weight of...

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