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Question:
a) Describe two mechanisms by which electrons can be excited from the valence band to the conduction band?
b) Given that the direct-band gap energy for Gallium Nitride (GaN) is 3.4 eV at room temperature, calculate the phonon energy and phonon momentum that you can expect from such a material with a lattice constant of 3.186 Å and velocity of sound of 5x103 m/s.
c) Given a P-type semiconductor with NA and ND atom concentrations of 8x1011 cm-3 and 3x103 cm-3 respectively, calculate the electron concentration assuming ni = 1.4x1010 cm-3.
d) What do you understand by the Fermi Level of a crystal? According to the Fermi-Dirac function, what is the temperature at which there is 1% probability that a state, with an energy 0.5 eV above the Fermi energy, will be occupied by an electron?
e) Given a piece of N-type silicon at 0 ºC,
i. Calculate the thermal velocity of an electron with an effective mass of 1.18m0 and a mobility of 0.25 m2V-1s-1.
ii. What is the electric field that needs to be applied to make the electron drift at a velocity of 1000 ms-1?
what is the method to do this project and what material used for?
A three-phase, wye-connected, cylindrical-rotor, synchronous motor, with negligible armature resistance and a synchronous reactance of 1.27 per phase, is connected in parallel wit
Consider the circuit shown in Figure with R 0 , (b) the quality factor Q, and (c) the maximum impedance Z m . Comment on the applicability of the universal resonance curve.
Q. Discuss how Wavelet Transform is suitable for each application below. You can give examples if you need to. a) multi-resolution analysis of signals and images b) space-fr
What is meant by Wait State? This state is used by slow peripheral devices. The peripheral devices can transmitted the data to or from the microprocessor by using READY input l
The corners of wedge-shaped block are A(0,0,2), B(0,0,3), C(0,2,3), D(0,2,2), E(-1,2,2) and F(-1,2,3) and the reflection plane goes the Y-axis at 450 between (-X) & (Z) axis. Calcu
Q. What is error-rate control? A system is said to possess error-rate damping when the generation of the output in some way depends upon the rate of change of the actuating sig
Is there any electronics related papers like digital for free download
Explain AAS instructions in 8086 family with example and their effect on flag. AAS: it is stands for ASCII adjust after subtraction; this is used to adjust the AX register l
Define the Signals in Time Domain? The time domain is the type of visualization that most people are familiar with. This method shows variations of a signal with time. The most
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