Semiconductors and Superconductors
Physics ⇒ Modern Physics
Semiconductors and Superconductors starts at 11 and continues till grade 12.
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See sample questions for grade 11
A germanium crystal is doped with arsenic. What type of semiconductor is produced?
A sample of silicon is doped with phosphorus. What type of semiconductor is formed?
A silicon sample is doped with boron. What type of semiconductor is formed?
A superconductor is cooled below its critical temperature in the presence of a magnetic field. What happens to the magnetic field inside the superconductor?
Calculate the number of electrons contributed by a pentavalent dopant atom to the conduction band of silicon.
Calculate the number of valence electrons in a silicon atom.
Describe the effect of doping on the electrical properties of a semiconductor.
Describe the role of holes in the conduction process of a p-type semiconductor.
Describe what happens to the resistance of a superconductor as it is cooled below its critical temperature.
Explain the difference between intrinsic and extrinsic semiconductors.
Explain why pure silicon is a poor conductor at room temperature.
Explain why superconductors are used in maglev trains.
Explain why the conductivity of a semiconductor increases with temperature.
Explain why the resistance of a semiconductor decreases with increasing temperature.
Name the phenomenon by which a superconductor expels all magnetic fields from its interior.
What is the main difference between a conductor and a semiconductor in terms of their band structure?
A pure silicon crystal is heated from 300 K to 400 K. Predict and explain the change in its electrical conductivity.
A scientist is designing a device that requires a material with a very small but nonzero energy gap. Should the scientist choose a metal, a semiconductor, or an insulator? Explain your reasoning.
A semiconductor has an energy gap of 1.1 eV. Calculate the minimum wavelength of light (in nm) that can excite an electron from the valence band to the conduction band. (Planck's constant h = 6.63 × 10-34 J·s, speed of light c = 3.00 × 108 m/s, 1 eV = 1.6 × 10-19 J)
Describe how the application of a strong magnetic field affects the superconducting state of a material.
