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- The number density of conduction electrons in a metal can be found from the density ρ of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro’s number NA. If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal? a. NA ρM b.NA ρ/M c. NA M/ρ d. NA /ρM(i) The total electrical resistivity of metals is the sum of the contributions from thermal vibrations, impurities and plastic deformation; (ii) the resistivity rises linearly with temperature above -200 degree Celsius; (iii) increasing the concentration of impurity results in an enhancement of impurity; (iv) plastic deformation also raises the electrical resistivity due to the increased numbers of electron-scattering dislocations. Which of the above statements is false? D. (iv) A. (i) C. (iii) E. All of the above B. (ii) Other:What makes a material a good insulator? A the phase of the material B tightly bound valence electrons C the cost of the material D electrons can be easily shared
- In solid KCI the smallest distance between the centers of a. potassium ion and a chloride ion is 314 pm. Calculate the length of the edge of the unit cell and the density of KCI, assuming it has the same structure as sodium chloride.In a bipolar junction transistor: A) all the three regions (the emitter, the base and the collector) have equal concentrations of impurity B) the emitter has the least concentration of impurity C) the collector has the least concentration of impurity D) the base has the least concentration of impurityMetals are bonded by metallic bond, that is protons in a sea of electrons which give them their characteristic conductivity. If the electric current flows from one end to the other end using a copper wire to bridge the gap, the extra electron given through the electric current will cause the sea of electrons in the copper to? A. The electrons given will just be deposited in the sea of electrons with nowhere to go B. The electrons given will occupy the space of the electrons that were pushed. C. The electrons given will not flow to the metal because of repulsion. D. The electrons given will travel to the other end through the proton movement.
- Copper, a monovalent metal, has molar mass 63.54 g/mol and density 8.96 g/cm3. What is the number density n of conduction electrons in copper?In an n-type silicon, which of the following statement is true:(a) Electrons are majority carriers and trivalent atoms are the dopants.(b) Electrons are minority carriers and pentavalent atoms are the dopants.(c) Holes are minority carriers and pentavalent atoms are the dopants.(d) Holes are majority carriers and trivalent atoms are the dopants.Is a semiconductor a good example to illustrate the contrast between a conductor and an insulator? A graph may help you make your case.
- A Pentium IV microchip has dimensions of 217 mm x 217 mm. Suppose each transistor on the chip is made up of a 10 x10 square of atoms (that is 100 atoms per transistor). How many transistors could fit on the Pentium IV chip if the spacing between the silicon atoms is 0.54 nm?why do we dope at semi conductorsWhat is the magnitude of the electrostatic force between a singly charged sodium ion (Na+, of charge +e) and an adjacent singly charged chlorine ion (Cl-, of charge -e) in a salt crystal if their separation is 2.82 * 10-10 m?