Diamond is a _______ crystal.
opaque
transparent
translucent
none of the above
Increased ______ causes the carbon atoms to splits in diamond.
Thermal energy
wind energy
kinetic energy
vibrational energy
In ______________ crystals, the units occupying lattice are positive and negative ions.
Metallic
Covalent
Ionic
Molecular
______________ defects appears generally in ionic crystal in which the positive and negative ions donot differ much in size.
Point
Frenkel
Schottky
Metal excess
_________________ crystal consists of an assemblage of positive ions immersed in a sea of mobile electrons.
If the deviation occurs due to missing atoms, displaced atoms or extra atoms, the imperfection is named as
Schottry defect
Point defect
Frenkel defect
Metal excess defect
The conductivity due to the positive holes are called
Superconductors
n-type semiconductor
p - type semiconductors
Conductors
W.L.Bragg and Wt Bragg derived a mathematical relation to determine interatomic distances from _____________ patterns.
X-ray diffraction
Wavelength
Interatomic distance
Crystal diffraction
Which crystal vapourize at 7000oC?
sodium chloride
graphite
diamond
silicon carbide
An example of metal excess defects is
Agcl
Nacl
Cscl
Fes
