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- Q1/GaAs is a semiconductor compound has number of electrons (n) of 1023/m³, electron charge (q) of (1.602 x10-¹9) c, electron mobility (He) of (6.2422 x10-¹1) m²/v.s at 25 c°. " Estimate the tempreture in (cº) that GaAs has conductivity of 3.7 x 10˚³ (Q -m)`¹ where Eg of 1.42 ev, K of 8.62 x 105 ev / kTwo new materials have been discovered. One is shinyand has a metallic look, while the other is dull andhas a non-metallic look. Although you think that oneis a conductor and the other an insulator, you wantto be certain. Describe a test you could do to test theconductivity of these two materials.(a) The resistance, R, of a series of aqueous NaCl solutions was measured in a cell with cell constant, C = 0.2063 cm¹, and the data found are tabulated below: Concentration / mol dm-³ 0.0005 0.001 0.005 0.01 Resistance / 3314 1669 342.1 174.1 Using a graphical method, determine (i) the limiting molar conductivity, Aºm. (ii) the Kohlrausch's law coefficient, K. 0.02 0.05 89.08 37.14
- (c) If the gate oxide were destroyed by a static electricity discharge, speculate on how the current readings might be different from those that were observed.Be detailed in your response. (d)Using an electron mobility value of μn= 800 cm2/V-s and a gate oxide thickness of xox= 80 nm, compute the value of Kn= μnCox.From this value and some of the simulateddata points (where the drain current is saturated) make a rough estimate of the W/L ratio for the 2N7000 MOSFET. Does this W/L ratio seem reasonable?A flow of 50 m3/s of air exits a manufacturing facility, containing particles whose drift velocity is 0.121 m/s. Assume that 99.2 percent removal efficiency is required. (a) Calculate the total plate surface area for an electrostatic precipitator. (b) Estimate how many plates are needed. Assume the plates available for this unit measure 2 m by 5 m.Differentiate between MOSFET and JFET transconductance curves.
- The vañation er sesutance Rohms g conductor wlh dR an aluminium gwen by is Hhe tomperatuce coeffeaent femperature 8°C is uohere x AR, of =DaR do resistance aluminiu's. If R=Ro where e = o°c sowe Hee equahos 'forR and f x= 4ox 10"/°C determine an alumununs at $5°C nohen its Hhe sesistance cesistance at 0C is 22.02,Q7.(Page No.369, 18.9 Exercises, Problem No.3) The resistivity of a sample of germanium is 6.0 x 10-2 m. A cylinder of germanium 5.0 mm long and 0.50 mm in radius has a p.d. of 10 V applied across its ends. (a) What current passes through the specimen? (b) What is the current density (1/A) in the sample?(c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of diameter 2.25 mm is to be used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed, answer the following i. What is the conductivity of the aluminium wire? ii. Give two reasons why aluminium wire is not used in domestic wiring in Zambia? iii. Give three applications of pure aluminium.
- The distance d between two parallel conductive plates, each of which has a surface area of S, is the upper plate and the lower plate held at potential VO and 0, respectively. An inhomogeneous ohmic piece of thickness d, whose conductivity is given by the relation o(y)=o1+(o2-o1)yd and varying linearly from ơ1 to o2, is placed in the gap between the plates. According to this, a) Find the total resistance between the plates. b) Find the surface charge densities on the plates. c) Find the volumetric charge density between the plates and the total charg1 (a) Using Townsend's second ionization criterion, consider I, 4 x 10-7 A. Consider a = 2.28/cm. If y = 0.0075, find the gap spacing dspark in cm for spark breakdown criterion. Calculate the current I in A for (i) d = 0.45 xdspark , (ii) d = 0.6 x dspark and (iii) d = 0.8 x dspark Show that the current I = Io exp (ad) when d is very small value and y is also very small value. 1,ead 1- y(ead – 1) (b) For a point-plane gaseous dielectric system, suppose values of a = 2.24 / cm and y = 0.0064. d Find the values of for d = 1.25 cm and d = 1.95 cm. ddFiad the Porer Cin watts ) delivered to the Ro0 n resista Round your answn to 2 Necinalplares.