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Fermi Dirac level:
Sol. The Fermi level is simply a reference energy level. It is the energy level at which the probability of finding an electron n energy unit above it in the conduction band is equal to the probability of finding a hole n energy units below it in the valence band. Very simply, it can be considered to the average energy level of the electrons, as illustrated in fig. (a). For simplification let us assume that (i) widths of energy bands are small in comparison to forbidden energy gap between them (ii) all levels in a band have the same energy, bandwidths being assumed to be small (iii) energies of all levels in valence band are E0, as shown in fig. (a) and (iv) energies of all levels in conduction band are EG. Let the zero energy reference level be taken arbitrarily at the top of the valence band, as shown in fig. (b). Now number of electrons in conduction band, where P represents the probability of an electron having energy EG. Its value may be determined from Fermi Dirac probability distribution function given as where P (E) is the probability of finding an electron having any particular value of energy E.
Hard magnetic materials are used for making (A) Permanent magnets. (C) Conductors. (B) Insulator. (D)Temporary magnets. Ans: Hard magnetic materials are
Fundamental of Metal Casting: Fundamental of Metal Casting : Casting process is based on the property of a liquid to take up the shape of vessel containing it. Molten metal
How is bias compensation in transistor is done using thermistors and sensistor
Customer Relationship Management Software CRM software products are most varied and variable in cost and functionality. The significant CRM software application includes: a
short note on cumulative error
Q. Find the rate of information transmission? If the time occupied in transmitting each binary digit is 1 µs, find the rate of information transmission if 1 baud is equal to 1
how to write a matlab program for TITO system to draw nyquit plots.
Determine Total magnetic flux: A ring is composed of three sections. The cross-sectional area is 0.001 m2 for each section. The mean lengths of each section are l a = 0.3 m,
Q. With the help of the structures explain LCD. A liquid crystal display (LCD) is a thin, flat display device made up of any number of color or monochrome pixels arrayed in fro
An interrupt which can be never be turned off (ie. disabled) is called as Non-Maskable interrupt.
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