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Calculate the diffusion constant for the holes when the mobility of the holes is 400cm2/V-s and temperature is 300K?
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system. For equimolar counter current diffusion:
Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle     4. Diesel cycle     5. Brayton cycle
Match List 1 with List 2 and choose the correct answer form the code given below: List 1 (Cultural diffusion) List 2 (Definition) (a) Relocative  1.Upward/downward movement of dispersal through a system of classes or centres (b) Hierarchical Diffusion  2. When acceptance of or information about an innovation spreads throughout the society (c) Expansion Diffusion  3. When expansion affects almost uniformly to all individuals and areas from a source region (d) Contagious Diffusion  4. Geographical transfer of culture traits by movements of people across space
The statement concern psychrometric chart. 1. Constant relative humidity lines are uphill straight lines to the right 2. Constant wet bulb temperature lines are downhill straight lines to the right. 3. Constant specific volume lines are downhill straight lines to the right. 4. Constant enthalpy lines are coincident with constant wet bulb temperature lines. Which of the statements are correct?
Concentration of hydrogen gas across a 2mm thick palladium sheet differs by 4 kg/m3. Considering steady-state diffusion with diffusion constant 10-10 m2/s, diffusion flux is ______ kg/m2.s:
Consider a silicon wafer having Nc=2.8*1019cm-3 and the Fermi energy is .25eV below the conduction band. Calculate the equilibrium concentrations of electrons at T=300K?
Match List-I with List-II and select the correct answer using the code given below the Lists: List I (Low-Latitude Climate) List I (Characteristic) A. Wet Equatorial 1. Uniform temperatures, mean near 27°C  B. Monsoon and trade wind coastal 2. Marked temperature cycle with very high temperature before the rainy season C. Wet-dry tropical  3. Temperatures show an annual cycle with a high temperature in the high-Sun season Strong temperature cycle. with intense temperature during the high-Sun season  D. Dry tropical 4. Strong temperature cycle, with intense temperature during the high-Sun season
Diffusion through grain boundaries is very fast and is called short-circuit diffusion. Assertion: Their contribution to overall diffusion is negligible.