What is an impurity defect?

What are impurity defects ? Explain.

What is super conductivity? Define impurity defects of solid with example.

What is point defect? Give an example.

What is impurity or extrinsic semiconductor? Give an example.

What is the point defect due to the presence of foreign atom ? Explain with suitable example.

What is pure and impure spectrum?

What is Schottky defect? Is it a stoichiometric or non-stoichiometric defect? What type of ionic crystals are likely to show this type of defect? Does the presence of this defect in a crystal increase or decrease the density of the crystal? Explain.

What is the principal defect of Bohr atom model?

What is crystal defects? Why ZnO when heated becomes yellow?

What is Schottky defect ? Find out the packing effciency in a simple cubic lattice ?