Solids and Unit Cells

A collection of geometrical points in 3-d space arranged in a regular periodic manner is called ________

• lattice

• basis

• unit cell

• primitive cell

In primitive cells the lattice points are ___________

• only inside the cell

• only at the corners

• either inside the cell or at the corners

• neither inside the cell nor at the corners

Which of the following is not correct?

• Crystalline solids are anisotropic.

• Lattice + Basis = Crystal

• The various crystal planes are specified by a set of three numbers called Miller indices.

• All Unit cells are Primitive cells.

In a cubic crystal, a given plane intercepts the axes at 3a, 3b & c. The Miller indices of the plane are ________

• ( 3 3 1 )

• ( 1 3 3 )

• ( 1 1 3 )

• ( 3 1 1 )

In a crystal, a given plane is parallel to the 'a' axis and 'b' axis and intercepts the 'c' aces at c. The Miller indices of the plane are

• ( 0 0 1 )

• ( 1 1 0 )

• 
• ( 1 1 1)

In a simple cubic crystal, the Miller indices of the plane are as shown in the image. The given plane intercepts the axes at -----------.

• a, 2b & c

• a, 2b & ---- c

• 2a , b & --- 2c

• a, ---- b & c

The lattice constant of a unit cell of a cube is 3.28 Angstrom. The interplanar spacing of ( 2 0 1 ) plane is ------ Angstrom.

• 1.093

• 1.467

• 1.641

• 0.986

The inter planar spacing between ( 1 2 2 ) planes found to be 2.35 Angstrom. The lattice constant in case of simple cubic is -------- Angstrom.

• 0.261

• 0.783

• 7.05

• 21.15

In a given crystal, the inter planar spacing is 0.323 nm. The 2nd order maximum occurs at glancing angle 8 degree. The wavelength of incident ray is --------- Angstrom.

• 0.9

• 0.09

• 0.45

• 0.045

Tags

NGSS.HS-PS4-1

For a crystal, X-rays of wavelength 1.54 Angstrom irradiated ( 1 2 1 ) planes. If the inter planar spacing is 1.1 Angstrom, then the order of Bragg's diffraction is --------

• 1

• 2

• 1.43

• 2.43

Tags

NGSS.HS-PS4-3