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When an electric field is applied to accelerate them or when the temperature of the crystal is raised.
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Effective density of states in conduction band?
All of the distributed electron states in the conduction band is represented by an effective density of states (NC)
How does a conductor and insulator work?
CONDUCTORThe distance between conduction band and valence band is very small therefore an electron can easily jump to conduction band by overcoming weak nuclear forces. Hence, electric current can easily flow through it.INSULATORThe distance between conduction band and valence band is very large therefore an electron cannot jump to conduction band by overcoming weak nuclear forces. Hence, electric current cannot flow through it.
Why is a rubber band an 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.
A conductor with a high temperature is likely to have a high?
Since you are talking about conductors, a high temperature one will have a high resistance. Reason being that the distance between the conduction and the valence band keeps on increasing on the increase of temperature. A substance is said to be conducting if it has FREE electron in its conduction band. Since the distance b.w the to bands increases, less number of electrons are able to jump from valence band to conduction band, hence more resistance...
Why does the electrical conductivity of pure metal decrease with temperature while that of semiconductors increases?
The conductivity depends on the passage of charged particles especially electrons. In metals electrons are easily available in conduction band and so its conductivity is high. As we increase the temperature then core of atoms vibrate largely. So with positive charge it could easily minimize the electrons in the conduction band and hence fall in conductivity In case of semiconductor there will be usually forbidden gap between valence band and conduction band. So conduction is poor at ordinary temperature. But as we increase temperature that would allow electrons to reach conduction band as covalent bonds get broken. Hence higher conductivity
Are free electron in valence band or conduction band?
In semiconductors free electrons are in conduction bands.
Possibility of holes in conduction band?
hoes are vacancies left by the electron in the valence band. hence there cannot be holes in the conduction band
What are the difference between direct and indirect band gap materials?
In a direct band gap the electron only needs energy to jump to the conduction band. In an indirect band an electron needs energy and momentum to jump to the conduction band
Why are Monovalent metal so conductive?
The single valence band electron can easily escape and become a conduction band electron.
Effective density of states in conduction band?
All of the distributed electron states in the conduction band is represented by an effective density of states (NC)
Why does aluminum conduct?
Because it has a free electron in the conduction energy band.
What nonmobile nuclei are surrounded by a sea of mobile electron?
Conduction Band
Why does aluminum conduct electricity?
Because it has a free electron in the conduction energy band.
What is the working principle of Light Emitting Diode and their commercial types?
when electron is excited from valence band to conduction band
How does a conductor and insulator work?
CONDUCTORThe distance between conduction band and valence band is very small therefore an electron can easily jump to conduction band by overcoming weak nuclear forces. Hence, electric current can easily flow through it.INSULATORThe distance between conduction band and valence band is very large therefore an electron cannot jump to conduction band by overcoming weak nuclear forces. Hence, electric current cannot flow through it.
Why is a rubber band an 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.
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.
