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If both electrons as well as holes are present the conductivities add. This is because under the effect of an applied electric field the holes as well as electrons flow in opposite directions as well as a negative charge moving in the (say) +z direction is equivalent to a positive charge moving in the -z direction.
Presume that in a certain semiconductor the ratio of electronic mobility, µe, to hole mobility, µh, is equal to 10, the density of holes is Nh=1020 m-3, as well as the density of electrons is Ne=10-19 m-3. The measured conductivity is 0.455 ohm-1.
Compute the motilities
When optically active B was treated with CrO3 in pyridine, an optically inactive sample of A was obtained. Heating A with hydrazine in base gave hydrocarbon C, which, when heated with alkaline KMnO4, gave carboxylic acid D. Identify compounds A, B..
Carotenoids, present in all organisms' capable of photosynthesis, extend the range of light absorbed by the organism. They exhibit maximal capacity for absorption of light in the range of 440-470 .nm
A solution containing 26.50mg of an unknown protein per 29.5mL solution was found to have an osmotic pressure of 3.75torr at 13C. What is the molar mass of the protein
Compute the theoretical yelled percentage of a reaction between sodium and water if 25.0 g of sodium react with excess water and is 15.5 L of gaseous hydrogen are collected at as well as TP conditions
Depending on temperature, RbCl can exist in either the rock-salt or CsCl structure type. Give the cation and anion coordination number for each structure type.
Explain how some solids (compounds that are solids at room temperature) can be analyzed by gas chromatography. Also, how can they be introduced into the injector port and column
A perfect gas has a constant volume molar heat capacity of CV,m = 1.5× R, and a constant pressure molar heat capacity of Cp,m = 2.5× R. For the process of heating 4.50 mol of this gas with a 12 W heater for 400 seconds, calculate
What is the volume of the filled balloon If the gas is used to fill a balloon, at a pressure of 0.96 atm,?
Correct the absorbance of the spiked samples for dilution and plot the absorbance versus ppm Fe added. Extrapolate the graph to the point where absorbance is equal to zero to determine the amount of Fe in the cat food sample in ppm.
What is the value of the rate constant. What is the reaction rate when the concentration of NO2(g) is 0.842 M and that of O3(g) is 1.82 M if the temperature is the same as that used to obtain the data shown above
An equilibrium mixture at 225 degrees contains 0.14M NH3 and0.19 M H2 for the reaction of 3H2+N2=2. If the Kc at this temp is 1.0*102, what is the equilibrium concentration of N2
A vessel contains 0.90g liquid H2O in equilibrium with water vapor at 30C. At this temperature, the vapor pressure of H20 is 31.82 torr. What volume increase is necessary for all of the water to evaporate'
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