Podcast
Questions and Answers
What is the role of free electrons in a conductor?
What is the role of free electrons in a conductor?
- They create a forbidden energy gap
- They are responsible for the conduction of current (correct)
- They fill the valence band
- They are responsible for the bonding of atoms
Which type of material has a full valence band?
Which type of material has a full valence band?
- Inert gases (correct)
- Metals
- Semiconductors
- Insulators
What happens if a substance has an empty conduction band?
What happens if a substance has an empty conduction band?
- It becomes an insulator
- It can conduct current effectively
- It cannot conduct current (correct)
- It becomes a semiconductor
What does the forbidden energy gap represent?
What does the forbidden energy gap represent?
What defines whether the valence band is full or partially filled?
What defines whether the valence band is full or partially filled?
What is the significance of the conduction band being empty in insulators?
What is the significance of the conduction band being empty in insulators?
Which orbit has more energy, the inner or outer orbit?
Which orbit has more energy, the inner or outer orbit?
What form does an electron emit when it jumps from a higher orbit to a lower one?
What form does an electron emit when it jumps from a higher orbit to a lower one?
What is a convenient way to represent the energy of different orbits?
What is a convenient way to represent the energy of different orbits?
In a solid atom influenced by neighboring atoms, do electrons in any orbit have a single energy value?
In a solid atom influenced by neighboring atoms, do electrons in any orbit have a single energy value?
What happens to the energy level as the orbit of an electron becomes larger?
What happens to the energy level as the orbit of an electron becomes larger?
How are the values of radii for orbits determined?
How are the values of radii for orbits determined?
Electrons in the third orbit of an atom have _______ energy compared to the electrons in the second orbit.
Electrons in the third orbit of an atom have _______ energy compared to the electrons in the second orbit.
When an electron jumps from a higher orbit to a lower orbit, it _______ energy.
When an electron jumps from a higher orbit to a lower orbit, it _______ energy.
According to Bohr’s theory of atom, which of the following is quantized?
According to Bohr’s theory of atom, which of the following is quantized?
A semiconductor has an almost empty _______ band.
A semiconductor has an almost empty _______ band.
The electrons in the conduction band are known as _______.
The electrons in the conduction band are known as _______.
In insulators, the energy gap between valence and conduction bands is _______.
In insulators, the energy gap between valence and conduction bands is _______.
According to Bohr, what happens when an electron is given additional energy?
According to Bohr, what happens when an electron is given additional energy?
What is the relationship between the radius of an electron orbit and its energy according to Bohr?
What is the relationship between the radius of an electron orbit and its energy according to Bohr?
Why does an atom in an excited state not last long?
Why does an atom in an excited state not last long?
What happens when an electron falls back to its original lower orbit?
What happens when an electron falls back to its original lower orbit?
How many electrons does a silicon atom have according to Bohr's model?
How many electrons does a silicon atom have according to Bohr's model?
What happens if an electron in the first orbit is lifted to the second orbit?
What happens if an electron in the first orbit is lifted to the second orbit?
What happens to the resistance of an insulator as the temperature increases?
What happens to the resistance of an insulator as the temperature increases?
Why do conductors like copper and aluminium easily allow the passage of electric current?
Why do conductors like copper and aluminium easily allow the passage of electric current?
How can the electrical behavior of conductors be satisfactorily explained?
How can the electrical behavior of conductors be satisfactorily explained?
What distinguishes semiconductors from conductors and insulators in terms of energy bands?
What distinguishes semiconductors from conductors and insulators in terms of energy bands?
Why is a smaller electric field required in semiconductors compared to insulators to push electrons from the valence band to the conduction band?
Why is a smaller electric field required in semiconductors compared to insulators to push electrons from the valence band to the conduction band?
What characteristic lies inbetween conductors and insulators that defines semiconductors?
What characteristic lies inbetween conductors and insulators that defines semiconductors?
