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What is the phenomenon of superconductivity in regards to low temperature, Type I, Type II, high temperature, and Cooper pairs?
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- What is a superconductor? Give one example of it.Would you expect superconductivity from a material with little or no crystal structure (referred to as a "glass")? Probably not. If so, what are the reasons for it or why it isn't?Is it reasonable to expect superconductivity in a "glass," a material with almost no crystalline structure? Why or why not, if that's the case?
- What are type I and type II superconductors?Can superconductors be used in daily life working? Explain in your own words with the help of example(s).Q#07: The maximum wavelength of light that a certain silicon photocell can detect is 1.11 micrometer (a) what is he energy gap (in eV) between the valence and conduction bands for this photocell (b) Explain why pure silicon is opaque.
- What is the critical temperature for a superconductor?A high electron mobility transistor (HEMT) controls large currents by applying a small voltage to a thin sheet of electrons. The density and mobility of the electrons in the sheet are critical for the operation of the HEMT. HEMTS consisting of AlGaN/GaN/Si are being studied because they promise better performance at higher powers, temperatures, and frequencies than conventional silicon HEMTS can achieve. In one study, the Hall effect was used to measure the density of electrons in one of these new HEMTs. When a current of 12.1 ?A flows through the length of the electron sheet, which is 1.12 mm long, 0.223 mm wide, and 15.1 nm thick, a magnetic field of 1.05 T perpendicular to the sheet produces a voltage of 0.511 mV across the width of the sheet. What is the density of electrons per m3 in the sheet?6. In a regular FCC, determine number of atoms per unit area in (1 1 0) plane 7. In a BCC unit cell, determine number of atoms per unit area in (1 1 1) plane 8. Assuming that each Au atom donates one conduction electron, calculate the drift mobility and drift velocity of the conduction electrons in gold at 20° C if the applied electric field is 200 V/cm. What is the mean free path of the conduction electrons if their mean speed is 1.4 x 10°m s ? Resistivity of pure gold at 0°C (273 K) is po= 22.8 n2 m. a, for Au from Table 2.1 is 1/251 K'. Given that Au is FCC with lattice parameter of 0.407nm. 9. Na is a monovalent metal (BCC) with a lattice parameter of 0.43nm. The drift mobility of clectrons in Na is 53 cm V's'. Calculate the electrical conductivity of Na and the mean scattering time of conduction electrons. 10. Determ ine Miller Indices for the following: A 1/2
- Is it feasible to describe the distinction between a conductor and an insulator using a semiconductor as an example? Why not use a graph to explain your points?5. Please select the correct answer: (a) Acceleration of a free electron and its collision with the host atoms and ionize them in solid, which leads to electron avalanche breakdown. (b) The flow of a substantial current between the electrodes, which appears as a (II) Dielectric strength short between the electrodes when the voltage across a dielectric material exceeds from a critical voltage. (c) The gradual growth of microstructural voids, cracks, or pores within the dielectric due to partial discharge, which leads to electrical tree type of discharge. (d) The maximum field that can be applied to an insulating medium without causing dielectric breakdown. (I) Dielectric breakdown (III) Intrinsic Breakdown (IV) Internal DischargesWhat are the different types of four layered diodes? What are its functions and characteristics? Include the voltage and current characteristics.