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1) When discussing the ganeration of electron/holes pairs by light in semiconductors is it best to use the wave or particle rendition of light energy?
a. Wave
b.Particles
2)In what type of electron transition from valence to conduction band is momentum conserved?
a. direct
b. indirect
3) Can a 10% efficiency one square meter in area solar panel placed in direct sunlight power a 100 watt light bulb?
Yes or No
4) If electrons move toward or away from regions of high electron concentration?
a. Move toward
b. Move away
5) If electrons are moving in the presence of an electric field and the field in turned off, do they continue to move or come to rest with zero velocity?
a. Continue to move
b. come to rest
A discrete-time signal x[n] is periodic with period 8. One period of its DFT harmonic function is {X[0],...,X[7]}={3,4+ j5,- 4 - j3,1+ j5,- 4,1- j5,- 4 + j3,4 - j5}. (a) What is the average value of x[n] (b) What is the signal power of x[n]
Determine the cost per kilowatt hour for the energy delivered by a typical alkaline 9-V "transistor" battery that costs $1.95 and is capable of delivering a current of 50 mA for a period of 10 hours. (For comparison, the approximate cost of energy..
Discuss how the angle of the incident light affected the solar cell? How could solar cell designs and/or installations be designed to counter this affect?
Message signal m(t) = 0.6sin(27r3000t + pi/9) For a carrier signal with amplitude Ac = 4,fc = 40MHz, What is the signal bandwidth if we use AM with ka = 0.7 DSB-SC FM with kf = 5000 - HZ/V
Binary symmetric channel, Assume that we are transmitting binary digits over a binary symmetric channel. Let p(x=0)=p(x=1)=0.5.
A transmission line has the following per-unit-length parameters: L = 0.5 H/m, C = 200 pF/m, R = 4.0 /m, and G = 0.02 S/m. Calculate the propagation constant and characteristic impedance of this line at 800 MHz. If the line is 30 cm long
The mass spectrometer measurement section is a region of uniform magnetic field B= ˆxBms for z > 0. Ions enter the magnetic field (which exists for z > 0) at the origin with a known velocity +ˆz vz.
A ball is shot into the air at 30 degress above the horizontal. It's initial Velocity is 5m/s and lands at the same height that it is launched from. How far does it travel horizontally
a) Given that the refractive index of water is about 1.33, what is the polarization angle for light traveling in air and reflected from the surface of water b) Consider a diver in sea pointing a flashlight towards the surface of the water.
An overhead line conductor is supported at water crossing from two towers, the heights of the supports being 30 and 34.2 m respectively , above the water level , with a horizontal span of 325 m.
A tow truck applies forces F1 and F2 to the bumper of an automobile where F1 is horizontal. Determine the magnitude of F2 that will provide a vertical resultant force, and determine the magnitude of this resultant.
A combinational logic circuit has 3 outputs as described below: F1=Minterm(0,3,4) F2= minterm(1,2,7) F3= Maxterm=(0,1,2,4) Implement the circuit using a single decorder with active high outputs and external 2 input OR gates
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