Band Theory of Solids
Physics ⇒ Modern Physics
Band Theory of Solids starts at 11 and continues till grade 12.
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See sample questions for grade 11
A material has a band gap of 2.5 eV. Is it more likely to be a semiconductor or an insulator?
Describe how the band theory accounts for the difference in electrical conductivity between copper and diamond.
Describe the effect of light on the conductivity of a semiconductor.
Describe what happens to the band gap of a semiconductor when it is heavily doped.
Describe what happens to the band structure of a solid as the number of atoms in the crystal increases.
Explain the difference between a valence band and a conduction band.
Explain why insulators do not conduct electricity under normal conditions.
Explain why the band gap is important in determining the electrical properties of a material.
Explain why the conduction band is important for electrical conduction in solids.
Explain why the electrical conductivity of a semiconductor increases with temperature, while that of a metal decreases.
If the band gap of a material is 0 eV, what type of material is it likely to be?
In the band theory, what is meant by the term 'Fermi level'?
In the context of band theory, what is a forbidden gap?
In the context of band theory, what is meant by 'intrinsic semiconductor'?
State one reason why pure silicon does not conduct electricity well at room temperature.
What happens to the electrical conductivity of a semiconductor as temperature increases?
What is the band theory of solids?
What is the main difference between a direct and an indirect band gap in semiconductors?
What is the typical order of magnitude of the band gap in insulators?
