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Why matals are good conductors of electricity?
basically electricity conducition depends upon following factors - no of free or valance electrons - state of the electrons(ie the band where the electron is at the normal condition) since there are at most 3 electrons in the conduction band at all time in metals they are good conductors of electricity
Why are metallic compounds usually good conductors of electricity?
The electrons in their valiance band are loosely bound and generally form a cloud of free conduction band electrons filling the metal.
What is the difference between Free Electron Theory and Band Theory of solids?
Free Electron Theory:This theory tells that, metals conduct electricity because of the presence of free electrons in it. The outermost shells of metal atoms will be loosely bound with their nucleus. So the electrons in it are free to move anywhere in the solid.These electrons are called free electrons and they are responsible for the conduction of electricity.Band theory of solids:A solid is assumed to contain many bands in which the electrons in it are packed. The most important are valence band and conduction band. The energy of electrons in these bands will be different.The difference in energies of valence band and conduction band determines whether the solid is a conductor, semi - conductor or insulator.For insulators, the difference between energies of them ( energy gap ) will be very high, and for conductor, these bands overlap each other.The conduction band carries the electrons that conduct electricity, but the valence band has all the electrons in the ground state. Whether they go into the conduction band depends on the temperature and the energy gap between the bands. In a conductor, these bands overlap, and hence many electrons can become conducting. Thus, Band Theory explains distinction between metals and insulators, which Free Electron theory cannot do (since it assumes all valence electrons become conducting). Calculations are be performed to see which materials will have big energy gaps and which will have overlapping bands.
Why is phosperous calle donar impurity?
because it adds extra electrons to semiconductor crystal lattice. these electrons having no place in valence band move up to conduction band, where they are free to move.
What is it called when free electrons in metals transferring energy by colliding with other atoms or electrons?
conduction
Are free electron in valence band or conduction band?
In semiconductors free electrons are in conduction bands.
How does the transmission of an electrical signal occur through a wire?
A wire is made up of either copper or aluminium. Copper and aluminium have free electrons in their conduction band and on providing energy the valance band electrons can also be very easily transferred on to the conduction band.the propagation of the signal takes place through electrons getting transferred in the direction of the current.
Why matals are good conductors of electricity?
basically electricity conducition depends upon following factors - no of free or valance electrons - state of the electrons(ie the band where the electron is at the normal condition) since there are at most 3 electrons in the conduction band at all time in metals they are good conductors of electricity
What is a difference between forbidden energy gap depletion region in semiconductor?
forbidden energy gap or energy gap or band gap or band or Eg is the gap between the top of the valance band and bottom of the conduction band. If we apply the energy equivalent to Eg then the electrons in valance band will jump to the conduction band. Ravinder kumar meena stpi n depletion region is the region in semiconductor where there is depletion of free charge carriers.Ravinder kumar meena stpi n
Why are metal conductive?
Lots of free electrons in conduction band. This is commonly referred to as the electron gas.
Why are metallic compounds usually good conductors of electricity?
The electrons in their valiance band are loosely bound and generally form a cloud of free conduction band electrons filling the metal.
Why is phosperous donar impurity?
because it adds extra electrons to semiconductor crystal lattice. these electrons having no place in valence band move up to conduction band, where they are free to move.
What is the difference between Free Electron Theory and Band Theory of solids?
Free Electron Theory:This theory tells that, metals conduct electricity because of the presence of free electrons in it. The outermost shells of metal atoms will be loosely bound with their nucleus. So the electrons in it are free to move anywhere in the solid.These electrons are called free electrons and they are responsible for the conduction of electricity.Band theory of solids:A solid is assumed to contain many bands in which the electrons in it are packed. The most important are valence band and conduction band. The energy of electrons in these bands will be different.The difference in energies of valence band and conduction band determines whether the solid is a conductor, semi - conductor or insulator.For insulators, the difference between energies of them ( energy gap ) will be very high, and for conductor, these bands overlap each other.The conduction band carries the electrons that conduct electricity, but the valence band has all the electrons in the ground state. Whether they go into the conduction band depends on the temperature and the energy gap between the bands. In a conductor, these bands overlap, and hence many electrons can become conducting. Thus, Band Theory explains distinction between metals and insulators, which Free Electron theory cannot do (since it assumes all valence electrons become conducting). Calculations are be performed to see which materials will have big energy gaps and which will have overlapping bands.
Why is phosperous calle donar impurity?
because it adds extra electrons to semiconductor crystal lattice. these electrons having no place in valence band move up to conduction band, where they are free to move.
If a pure Si crystal has a million free electrons inside it how many holes does it have.what happens to the no of free electrons and holes if the ambient temperature increases?
If the crystal is pure Si (no dopants or impurities) then the number of free electrons in the conduction band will be equal to the number of holes in the valence band. Each electron leaves behind a hole when it is thermally excited into the conduction band. If the ambient temp. increases, there will be more thermal energy available which will increase both the number electrons and the number of holes.
Why is Aluminum considered conduction?
Aluminum having the free electrons so it is considered conduction
How does electricity passes so quickly in a good conductor?
electrons are present in different shells inside an atom of a conductor. protons present in nucleus cannot hold the valence (outermost) electrons so tightly therefore they are nearly free to move about. these electrons are called free electrons.so when electric field is applied to conductor the free electrons are drifted opposite to the applied electrtic field. field and electric current flows through it.hence electricity passes quickly in good conductor. this can be also explained on the basis of conduction band mechanism. there is a very small gap between valence band and conduction band. so free electrons can easily overcome the weak nuclear forces and can easily jump to conduction band hence produce elecricity more quickly.
