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A thin piece of semiconducting silicon will be used to fabricate an electrical device. This layer is 0.10 cm thick and cut into a strip 0.50 cm wide by 1.50 cm long. Electrical contacts are placed at opposite ends of its length. The intrinsic carrier concentration of the silicon at room temperature (300K) is 1.0x10^10 cm^3 and the bandgap energy is 1.12 eV. With this data answer the following questions. (a) If the application of 1.0 volt to the contacts results in a current of 0.019 amps, what is the resistivity in (ohm-cm) of the material? (b) If the material's conductivity is due to doping with aluminum to a level of [Al]= 1x10^10 atoms/cm^3 what is the resulting conductivity "type" and what is the mobility of these "majority" carriers in this material (assuming that the aluminum is fully ionized - i.e. all Al atoms donated electrons).
Approximately how many grams of KCl are there in 200 mL of a 4.0% by mass KCl aqueous solution? Assume that the density of solution equals that of pure water.
Chromium metal can be plated from an acidic solution of CrO3. CrO3(aq) + 6H+(aq) + 6e- -> Cr(s) + 3H2O How many grams of chromium will be plated by the passage of 19,300 C (coulombs)?
Given the following balanced chemical equation 2CH3H6+9O2-->6CO2 +6H2O, if 15.7 mol of water are formed, how many mol of O2 reacted
if titration of 20.0 mL of 1.50 M H2SO4 solution requires 25.0 mL of NaOH to reach equivalence point, what is the molarity of the NaOH titrant
calculate the molarity of 52.56 grams of al2so43 in 1.80 l of
What mass of cesium bromide must be added to .500 L of water (d=1.00g/mL) to produce a 0.144 m solution
What happens to the time at which the mid point of the breakthrough curve exists the column if the particle size is halved but the adsorption isotherm and column size stay the same?
1. Find the pH of a solution that has a concentration of hydrochloric acid equal to 0.001 M. 2. Find the normal pH of rainfall (not acid rain). Would a rain sample with a pH of 5.0 be considered "acid rain"
Giving examples give the mechanisms of Aldol condensation between two molecules of aldehydes and two molecules of ketones
Consider the reversible reaction: 2NO2(g)?N2O4(g)^-1 If the concentrations of both NO2 and N2O4 are 0.016 mol • L , what is the value of Qc? The answer is supposed to be 63 but how and why?
What is the pH of the solution obtained when 135 mL of 0.618 M NaOH is diluted to 16.0 L with water?
What is the maximum mass of aspirin (the theoretical yield) that could be produced in this reaction?
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