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a) The room-temperature electrical conductivity of a semiconductor specimen is 25 (ohm-m)-1. The whole concentration is known to be 2.5E+19 m-3. The electron and hole mobilities for this material are 0.38 and 0.18 m2/V·s, respectively. Compute the electron concentration. (Use scientific notation.) b) On the basis of the result in part (a), is the specimen intrinsic, n-type extrinsic, or p-type extrinsic?
atmospheric air at 300k and 100kpa is to be delivered to a line at 600k 200kpa. two possible schemes for doing this are
a 25 cm long glass fiber e 72.2 gpa v 0.25 has a fracture strength of 75 mpa. what is the minimum diameter of a fiber
in 2001 the united states produced 51 of its electricity in the amount of 1.878 1012 kwh from coal fired power plants.
Sketch the thermal circuit of the system. Label (using the above symbols) all pertinent nodes and resistances.
you have a freezer in you apartment that maintains an inside temperature at 12degreef. the coefficient of performance
Provide 2 separate reasons based on thermo physical properties from the appendices in the back, that together help explain this large disparity among the 2 heat transfer coefficients:
a closed tank having a volume of 2ft3 is filled with 0.30 lb of a gas. a pressure gage attached to the tank reads 12
A balanced-cross-flow compact heat exchanger is required for an air heating system that processes 0.5 kg/s air. The inlet temperature for the hot water is 295 K, and the cold air enters at 270 K to be heated to 287 K. The inlet pressure for the hot w..
the 580-ton tug is towing the 1200-ton coal barge at a steady speed of 6 knots. for a short period of time the stern
air with a mass flow rate of 10 lbms enters a poorly insulated nozzle operating at steady state with a temperature of
a pressure transducer has a natural frequency of 50 khz and a damping ratio of 0.4. it is to be used to measure
an alcohol manufacturing facility emits air with 500 ppm ethanol. the air flows out several roof vents at a total flow
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