types of conductor

Conductors

Conductors

Conductors

In conductors

Distinguish between (i) Intrinsic and Extrinsic semiconductor and (ii) n-type semiconductor and p-type semi-conductor.

p type semi conductor is formed when trace amount of impurity is added to silicon. The number of valence electrons in the impurity atom must be

Assertion: p-type semiconductors are good conductors of electricity due to metal excees defects Reason: f-centres are created due to metal excess defects

(a) If the radius of octahedral void is r and the radius of the atoms in the close packing is R, derive a relationship between r and R. (b) What is a semiconductor? Describe the two main types of semiconductors and conductor and contrast conduction mechanism in them.