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What are applications of direct and indirect band gap?
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and in indirect band gap the band electron falls from the conduction band to valance band by first going through the metastable state
What is the gap between valance band and conduction band in a semi conductor?
Conduction band - The unfilled energy levels into which electrons can be excited to provide conductivity.Valence band - The energy levels filled by electrons in their lowest energy states.
Why are metals thermally conductive?
Because metals are the good conductors of current. the conduction band and the valance band are overlap on each other,so when the current passes from the metal because of overlapping on both the bands current passes easily.
Why do the semiconductors have negative temperature coefficient whereas the metals have positive values?
Semiconductors: When temperature increases, more electrons jump to conduction band from valance bond. Hence resistance decreases. Metals: Already plenty of electrons are there in conduction band. When temperature increases, the electrons in conduction band of metal vibrate and collide each other during their journey. Hence the the resistance of metal increases with increase of temperature. S.Lakshminarayana
What is fermi level?
the highest energy level which an electron can occupy the valance band at 0k is called fermi energy level
What is energy gap?
there will be only certain energy levels in which electrons get filled up. In valence orbitals there will be many such energy levels and the energy gap between conduction band and valence band is called energy band gap.
Why acceptor energy level is near to valence band in p-type semiconductor?
valance band has lower energy level
What are applications of direct and indirect band gap?
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and in indirect band gap the band electron falls from the conduction band to valance band by first going through the metastable state
Why does oxygen and sulfur electron configuration form similar molecules?
Same "fullness" of the valance band.
Why is rubber a good electrical insulator?
The electron configuration of rubber (natural of artificial is such that there is a big gap between valance band and conduction band of electrons. Electrons has to make a transition from valence band to conduction band in order to conduct electricity.
Is foam a good conducter of heat?
In a foam there is a large gap between the conduction band and the valence of band in the atoms makng up the foam. If any object is to conduct electricity through it the gap between the conduction band amd the valance should be minimun or overlapping so that the electrons in the valance band can go into conduction band and conduct electricity
What is the valence of sugar?
You have a misconception about the meaning of the word valance. Elements have a valance, not compounds. Sugar has no valance.
Is silicon a direct band gap material?
Silicon is by all means an indirect band gap material.
Was there a real liberty valance?
No, he was a character in the movie The Man Who Shot Liberty Valance. Valance was played by Lee Marvin.
How many valance electrons in Co?
There are 27 valance electrons.
How many valance electrons does samarium have?
2 valance electrons
What is the gap between valance band and conduction band in a semi conductor?
Conduction band - The unfilled energy levels into which electrons can be excited to provide conductivity.Valence band - The energy levels filled by electrons in their lowest energy states.
