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A Si sample with 10^16/cm^3 donors is optically excited such that10^19/cm^3 electron-hole pairs are generated per second uniformlyin the sample. the laser causes the sample to heat up to 450K. find the quasi-fermi levels and the change in conductivity of the sampleupon shining the light. electron and hole life times are both 10us. Dp(diffusivity of holes)= 12cm^2/s Dn(diffusivity ofelectrons)= 36cm^2/s ni=10^14 cm^-3 at 450K. what is the change inconductivity upon shining light.
Research the recent history of gasoline pricing in your area, and attempt to relate any fluctuations you observe to documented supply and demand factors outlined in our book. Be sure to cite any references used.
An hydro-electric station has a turbine of efficiency 86% and a generator of efficiency 92%. The effecitive head of water is 150 m. Calculate the volume of water used when delivering a load of 40 MWfor 6 hours. Water weighs /000 kglm3.
Your code should ensure that the input characters are, in fact, part of the upper case alphabet. In the event of an incorrect input, your code should print a message indicating the offending character and exit. You may assume a maximum of 10 input ..
Explain the term 'multiplexing' in general and describe why it is particularly important in the transmission of PAM signals and describe the main factors upon which the maximum data rate over a channel depends.
Contrast the electron and hole drift velocities through a 10 um (micro meter) layer of intrinsic silicon across which a voltage of 5V is imposed. Let up = 480cm2/Vs and un=1350cm2/Vs.
You want to design a LUT toimplement an adder. The adder takes as input two 2-bit numbers. (a) What is the minimum size ROM that will be required. (b) What data is stored in each memory location in this ROM
Design the circuit to establish a dc emitter current of 1mA and provide the highest possible voltage gain while allowing for a maximum signal swing at the collector of +-2V. Use +10V and -5V power supplies.
(1) Explain what happens in a series circuit when the frequency makes Xc equal to XL. Does it have a name (2) What is the relationship between Ic and IL at Is minimum (3) Why is the source current, Is, minimum at certain frequency
A binary waveform of 53000 bits/sec is converted into an 8192 level waveform that is passed through a channel with a raised cosine-rolloff filter characteristic. The channel has a conditioned (equalized) phase response out to 4.0 kHz.
You have an amplifer with a nominal open-loop gain of 1000 (A = 1000), but the variance in the gain is 20% (meaning that the open-loop gain ranges in value from 800 to 1200). You want to use feedback to try to desensitize the gain.
A 10-hp, 230 V, 60 Hz, three phase Y- connected, synchronous motor delivers full load at a power factor of 0.707 leading. The synchronous reactance of the motor is j5 Ω per phase. The rotationnal loss is 230W and the field winding loss is 70W.
An electron in an infinitely deep potential well of thickness 4 Å is placed in a linear superposition of the first and third states. What is the frequency of oscillation of the electron probability density
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