Question

Consider the following statements as they apply to crystal structure. Decide if each is true or false. v Planes with Miller indices (101) are parallel to the z-axis of the crystal If gold crystallizes in a face-centered cubic lattice, each unit cell would contain four gold atoms Planes described with Miller indices (220) have M-8. ▼ There are seven crystal systems: cubic, tetragonal, orthorhombic, monoclinic, triclinic, hexagonal, and trigonal.

Answer 1

Consider the following statements as they apply to crystal structure. Decide if each is true or false. False Planes with Miller Indices (101) are parallel to the 2-axis of the crystal. False A space lattice is a fundamental unit from which the entire crystal can be constructed like the bricks in a wall. True If gold crystallizes in a face-centred cubic lattice, each unit cell would contain four gold atoms. False Planes described with Miller indices (220) have M = 8. true There are seven crystal systems: cubic, tetragonal, orthorhombic, monoclinic, triclinic, hexagonal, and trigonal. explanation: (101) plane is parallel to y - axis but not z -axis. because middle y = 0 unit cell is fundamental unit not space lattice space lattice is made of unit cell like brocks in a wall (220) , M = squareroot (2^2 + 2^2 + 0) = squareroot (8) not simple 8 remaining two are correct

explanation :

(101) plane is parallel to y - axis but not z -axis. becuase middle y = 0

unit cell is fundamental unit not space lattice. space lattice is made of unit cell like brocks in a wall

(220) , M = sqrt (2^2+ 2^2 + 0) = sqrt (8)

not simple 8

remaining two are correcct