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Question 1Consider the figure below which shows the energy-band splitting of silicon. If the equilibrium lattice spacing were to change by a small amount, discuss how you would expect the electrical properties of silicon to change. Determine at what point the material would behave like an insulator or like a metal.Question 2In terms of electron energy band structure, discuss, using diagrams, reasons for the difference in electrical conductivity between metals, semiconductors, and insulatorsQuestion 3(a) Explain why no hole is generated by the electron excitation involving a donor impurity atom.(b) Explain why no free electron is generated by the electron excitation involving an acceptor impurity atom.Question 4The following electrical characteristics have been determined for both intrinsic and p-type extrinsic indium phosphide (InP) at room temperature:σ (Ω -m)-1 n (m-3) p (m-3)Intrinsic 2.5 × 10-6 3.0 × 1013 3.0 × 1013Extrinsic (n-type) 3.6 × 10-5 4.5 × 1014 2.0 × 1012Calculate electron and hole mobilities.
Consider a model of a bone with a cemented prosthesis, where the outside radius of the bone is ro, the radius of the medullary cavity is rm, and the radius of the prosthesis is rp.
A uniform linear charge density of 4 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5 cm) surface centered on the origin. Determine the electric flux through this surface.
determine (a) the compression ratio, (b) the cycle efficiency, (c) exhaust temperature, and (d) mean effective pressure (kPa). Draw (e) a P-v diagram and (f) a T-s diagram
Plot the moment about B for 320mm
Each turbine stage isentropic efficiency of 85% FWH is open T-S diagram for cycle? What is thermal efficiency and the moisture content of the steam leaving the low-pressure turbine?
two solid cylinders rods AB and BC are welded together at B and loaded. determine the magnitude of the force P for which the tensile stress in rod AB is twice the magnitude of the compressive stress in rod BC?
Describe on your own words the three strengthen mechanism for metals (i.e. grain size reduction, solid solution strengthening and strain hardening). Be sure to explain how dislocations are involved in each of the strengthening techniques.
Calculate the modulus of elasticity of the aluminium alloy. Use the modulus to determine the length of a 1.25 m bar to which a stress of 210 MPa is applied.
a horizontal circular cylinder of diameter d 0.2m and length 2m is elastically mounted on two springs and towing tank
Calculate the minimal round-trip time delay for a radio communications link between Los Angeles and the satellite.
Find the differential equation governing the motion of the diver while she is in contact with the board. Neglect any rotational inertia and what is the peak de?ection of the diving board?
If the density of air is 1.20 kg/m^3 at the inlet and 1.05 kg/m^3 at the exit, determine the percent increase in the velocity of air as it flows through the dryer.
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