Quiz2spring2004 - ENSC 3313, Spring 2004 Quiz 2- ANSWERS

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ENSC 3313, Spring 2004 Quiz 2- ANSWERS Name_________________________ Answer ONLY 4 of the 6 questions, show all work, 1point each 1. We know that copper has the FCC crystal structure with an atomic radius of 0.128 nm and that it is very ductile. Calculate the planar density of copper atoms on the (111) plane in units of 1/nm 2 . The number of atoms per unit cell on the (111) plane is 2 (i.e., count 1/6 of the 3 corner atoms and 1/2 of the 3 face atoms). Now we calculate the area of this plane. 2 ) 111 ( 3 4 ) 12 )( 4 ( 2 1 R R R A = = 2 2 62 . 17 ) 128 . ( 3 4 2 = = nm PD 2. Enumerate the relationship between side lengths and the number of four fold symmetry axes for cubic, tetragonal, and orthorhombic unit cells. Which unit cell has a three fold axis of symmetry? Cubic has 3 four fold axes Tetragonal has 1 four fold axis Orthorhombic has 0 four fold axes The cubic unit cell has three fold symmetry axes along the body diagonals 3. SiC is a hard ceramic used as an abrasive with highly covalent bonding and crystal structure similar to...
View Full Document

Page1 / 2

Quiz2spring2004 - ENSC 3313, Spring 2004 Quiz 2- ANSWERS

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online