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?
A superconductor is cooled below its critical temperature in the presence of a magnetic field. What happens to the magnetic field inside the superconductor?
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)
Which element is commonly used as a p-type dopant in silicon semiconductors? (1) Phosphorus (2) Boron (3) Arsenic (4) Antimony
Which of the following best describes the band structure of an insulator? (1) Overlapping valence and conduction bands (2) Small energy gap (3) Large energy gap (4) No energy gap
Which of the following is a high-temperature superconductor? (1) YBa2Cu3O7 (2) Lead (3) Mercury (4) Tin
Which of the following is a property of high-temperature superconductors? (1) They operate above 77 K. (2) They are always metals. (3) They have low critical magnetic fields. (4) They are insulators at low temperatures.
Fill in the blank: In an n-type semiconductor, the majority charge carriers are ______.
Fill in the blank: The energy gap in a typical insulator is ______ than that in a semiconductor.
Fill in the blank: The process of removing all magnetic fields from a superconductor is known as the ______ effect.
Fill in the blank: The temperature below which a material becomes superconducting is called the ______ temperature.
A certain superconductor has a critical temperature of 90 K. Will it exhibit superconductivity at 100 K?
State whether the following statement is true or false: Doping a semiconductor with a trivalent element creates a p-type semiconductor.
State whether the following statement is true or false: The conductivity of a superconductor is infinite below its critical temperature.
State whether the following statement is true or false: The critical temperature of a superconductor is the temperature below which it becomes superconducting.
