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 12
A solid has a band gap of 2.5 eV. Is it more likely to be a conductor, semiconductor, or insulator?
A student claims that at high temperatures, even insulators can conduct electricity. Is this statement correct? Explain your answer.
Calculate the minimum energy (in joules) required to excite an electron from the valence band to the conduction band in a semiconductor with a band gap of 1.1 eV. (1 eV = 1.6 × 10-19 J)
Describe how doping affects the band structure of a semiconductor.
Describe the effect of temperature on the band gap of a semiconductor.
Describe what happens to the band structure of a semiconductor when it is heavily doped with donor atoms.
Explain the difference between direct and indirect band gap semiconductors.
Explain why pure silicon behaves as a semiconductor according to band theory.
Explain why the electrical conductivity of intrinsic semiconductors increases with temperature.
If the band gap of a material is 0 eV, what type of material is it according to band theory?
In the band theory, what is the significance of the Fermi level in a solid?
In the context of band theory, what is meant by the term 'forbidden gap'?
State the typical range of band gap energy for semiconductors in electron volts (eV).
The band gap of diamond is about 5.5 eV. Is diamond a conductor, semiconductor, or insulator?
