Engineering, 18.02.2020 04:50 rina62
Semi-conductors are made by adding impurities to silicon wafers. The silicon wafer is 0.1 cm thick and originally contains one phosphorus (P) atom for every 10 million Si atoms. After the diffusion process, there are 292 phosphorus atoms for every 10 million Si atoms at the top surface and the concentration at the bottom surface did not change. Calculate the concentration gradient in atomic percent/cm Note: The lattice constant of diamond cubic silicon is 5.4307 angstroms with 8 atoms per cell. The answer should have 3 decimals of accuracy.
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Engineering, 04.07.2019 18:10
What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.
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Engineering, 04.07.2019 18:10
Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.
Answers: 3
Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg โข k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
Engineering, 04.07.2019 19:10
The proportional limit is always greater than the yield strength for a material. a)-trune b)- false
Answers: 3
Semi-conductors are made by adding impurities to silicon wafers. The silicon wafer is 0.1 cm thick a...
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