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1. Consider an intrinsic material at 300 K. Under pressure, the band gap is reduced from 1.6 to 1.5 eV. By what factor does the electrical conductivity of this material increase?
2. Suppose you wish an intrinsic material to remain an electrical insulator at 800 K, having less than one conduction electron per cubic centimeter of material. What is the minimum band gap that is needed?
Determine the forces in members DE, and DJ, and IJ using the method of sections. Indicate whether each member is in compression or tension.
a 0.12-m3 rigid tank contains saturated refrigerant- 134a at 800 kpa. initially 25 percent of the volume is occupied by
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air enters the compressor of a gas turbine at 100 kpa 300 k and a volumetric flow rate of 5.0 m3s. the air is
How are lines narrowed so that high-resolution spectra can be obtained?
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Two kilograms of air within a piston-cylinder assembly execute a Carnot power cycle with maximum and minimum temperatures of 750 K and 300 K, respectively. The heat transfer to the air during the isothermal expansion is 60 kJ. At the end of the is..
a model of an airplane is to be tested at 20degc in a wind tunnel. the model is built to 112th scale. in order to match
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show that the continutiy equation for a inviscid irrotational flow leads to leplaces eqaution in terms of the velocity
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How does the finallength of the bar compare with its originallength? (Hint: Use the concepts illustrated in Fig. 1-16.)
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