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In a photomultiplier tube, assume that there are seven diodes with potentials 100, 200, 300, 400, 500, 600, and 700 V. The average energy required to free an electron from the dynode surface is 10 eV. For each incident ectron released from rest, how many electrons are freed at the first dynode? At the last dynode?
Describe the advantages and disadvantages of using taxes and bounties to regulate negative externalities.
Consider Example 12.4.1. With the assumed current-source excitations of part (c), determine the voltages induced in the stator and rotor windings at the corresponding angular velocity ωm at which an average torque results.
The limestone is supplied with average dimension 1.5 cm and must be reduced to 20 mesh before feeding to the gasification process. Recommend equipment to achieve the desired particle size and estimate the work required.
calculate the pounds of hydrogen that can be handled per minute when the power supplied to the pump is 224 kW. Kinetic-energy effects can be neglected.
The table below gives the enthalpy of benzene(1)-heptane(2) solutions at 20 °C 1 bar as a function of the mol fraction of benzene. Calculate and plot the excess enthalpy at 20 °C, 1 bar.
question 1suppose the system shown below. initially the gas is at 200 kpa and occupies a volume of 0.1 m3. the spring
Determine the original composition of the feed mixture and the composition of the resulting extract layer. free solution
The laboratory division of your company has sent you the following data for the system n-pentane (1) propionaldehyde (2) at 35 °C: The activity coefficients of the two components at infinite dilution are 4.0 and the saturation pressures of the pur..
An electron falls from the conduction band of silicon (Si) to the valence band. The band gap of Si is 1.1 eV. What is the wavelength of the photon emitted by this process? Give your answer in nm
Calculate the work done in the isothermal reversible expansion of one mole of CH4 (g) from 1.00 dm3 to 10.00 dm3 at 300 K. Treat methane as a van der Waals gas. The van der Waals gas constants for methane are: a=2.3026 dm6⋅bar⋅mol-2 and b=0.043067 dm..
If the gases leave the tower at 6 atm, 25 °C, and are expanded to, say, 1.5 atm, calculate the turbine exit gas temperatures without preheat, and if the gases are preheated to 400 °C with the reactor off-gas. Also, estimate the power recovered fro..
If a wye-delta starting method is employed, find the starting current and the starting torque.
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