Surface imperfections that separate two orientations that are mirror image of one- another is called
The grain boundary defects are called twin boundary when the surface imperfect orientations on the side are mirror image of those in the opposite side.
What is the linear density for FCC  direction in terms of the atomic radius?
Which of the following regions of the electromagnetic spectrum would be used to determine the structure of crystalline solids?
X-ray crystallography: A technique in which the patterns formed by the diffraction of X-rays on passing through a crystalline substance yield information on the lattice structure of the crystal, and the molecular structure of the substance.
The defect responsible for the phenomena of slip, by which most metals deform plastically, is known as
The correct order of co-ordination number in SC, BCC, FCC and HCP unit cells is
The maximum radius of the interstitial sphere that can fit into the void between the body centred atom of BCC structure is
Magnesium crystallizes in HCP structure. If the lattice constant is 0.32 nm, the nearest neighbour distance in magnesium is
The packing factor of diamond cubic crystal structure is
If (3 2 6) are the Miller indices of a plane, the intercepts made by the plane on the three crystallographic axes are
In a simple cubic lattice d100: d110: d111 is
where d is interpianer spacing.
Correct Answer :- D
Explanation : d100 = a/(12 + 02 + 02)1/2
d110 = a/(12 + 12+ 02)1/2
d111 = a/(12 + 12 + 12)1/2
d100 : d110 : d111 = a : a/(2)1/2 : a/(3)1/2
= 61/2 : 31/2 : 21/2