Analog Electronics by U.A.Bakshi, A.P.Godse

By U.A.Bakshi, A.P.Godse

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Kinds of emission The movement of electrons across a vacuum between two electrodes is the basic principle of operation of many electronic devices: it is thus essential for one of these electrodes to emit electrons and this can occur in at least one of four ways : (a) (b) (c) (d) Thermionic emission 1 i- Electrons given extra energy. Secondary emission Photoelectric emission J Field emission "Potential barrier" reduced. An electron well inside a metal is surrounded on all sides by a very large number of atoms and electrons, and the resultant electric force experienced by this electron on the average will be zero : it moves in a region of constant potential and we did in fact assume this when we drew the Fermi distribution curves of Chapter 3.

It must be emphasized that Fermi-Dirac statistics only apply to electrons in an unfilled energy band; the treatment of a filled band is much more complicated. 6. Statistics in physics The student will be interested to note that nuclear physicists make use of Bose-Einstein statistics, and this gives them the primary way of classifying fundamental particles. g. electrons belong to the latter group along with protons, neutrons, and neutrinos, whereas photons and π and K mesons belong to the former group.

A different type of atom would be represented by another building of a different height with a different arrangement of balconies. We can think of an atom as having a very dense central core surrounded by vague clouds of electrons; between the allowed energy levels there are forbidden bands, which are ranges of energy that electrons can never possess. Should the electron escape from the atom it can possess any energy and it is interesting to consider why this is not so within the atom. 3). The wavelength associated with the 44 BASIC PRINCIPLES OF ELECTRONICS electron is of the same order of magnitude as the interatomic spacing in the crystal lattice, and if the electron wave fits the space between the atoms in a certain way resonance will occur and the electron can no longer remain in the crystal.

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