15. Which of the following is TRUE?  a.   A conductor has a large amount of energy gap between conduction band and valance band  b.   A semi-conductor material does not allow the flow of electrons at all time.  c.   A good insulator material has 8 valance electrons  d.   A good conductor material has 3 valance electrons.

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Types of Charge Carriers

A carrier is a type of object which carries a particular thing from one point to another point. For instance, people use different vehicles from one place to another, and the vehicle carries those people and acts as a carrier.