The?forbidden gap?between the valence band and conduction band is very large in insulators. The energy?gap?of insulator is approximately equal to 15 electron volts (eV). The electrons in valence band cannot move because they are locked up between the atoms.
19) In a semiconductor, the forbidden energy gap between the valance band and the conduction band is of the order of
Answer is:
15ev
Explanation:
Related Electronic Devices and Communication MCQ with Answers
Answer is:
Width of forbidden energy gap
Explanation:
The main difference between conductors, semiconductors and insulators is because of Width of forbidden energy gap
Answer is:
5 ev
Explanation:
In an insulator, the forbidden energy gap between the valance band and conduction band is of the order of 5ev
Answer is:
intrinsic
Explanation:
An?intrinsic semiconductor?is an undoped semiconductor. This means that holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped?semiconductors?where holes or electrons are supplied by a ?foreign? atom acting as an impurity.
Answer is:
Trivalent substance
Explanation:
A small impurity is added to germanium to get p-type semiconductor. This impurity is a Trivalent substance