Kerja Lab Lanjut Quiz 5

An amorphous material is __ and has a __ structure.

• ordered; crystalline

• semiordered; semicrystalline

• disordered; crystalline

• disordered; noncrystalline

An anisotropic property is one that has different values in different __.

• isotropies

• anisotropies

• crystallographic directions

• crystallographic isotropies

An example of an amorphous material is __.

• semicrystalline SiO2

• noncrystalline SiO2

• crystalline SiO2

• iron

Aluminum has __ modulus of elasticity in different directions.

• different values of the

• the same values of the

• zero

• infinite

The atomic-packing factor is the __ of the unit cell volume that is __.

• fraction; not occupied by atoms

• fraction; occupied by atoms

• volume; not occupied by atoms

• volume; occupied by atoms

APF = __

• Vatoms + V unit cell

• Vatoms - V unit cell

• Vatoms / V unit cell

• Vatoms * V unit cell

A body-centered cubic unit cell has atoms on each corner of the unit cell and __.

• none in the body center

• two in the face center

• one in the face center

• one in the body center

Bragg’s law is the fundamental law of __.

• Bragg crystallography

• Bragg crystals

• Bragg structure

• X-ray crystallography

Bragg’s law states that n*L = __, where n is an integer, L is the wavelength of X-rays incident on a crystal, d is the distance between lattice planes, and theta is the Bragg angle.

• 2*d/sin(theta)

• 2*d*sin(theta)

• *d + sin(theta)

• 2/d*sin(theta)

The close-packed direction is that direction where the atoms __ in the unit cell.

• touch

• do not touch

• close

• spread