By C. Balanis [SOLUTIONS] [non-OCR]
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Additional resources for Antenna Theory - Analysis and Design
This regularity of shape was extra evidence to the scientists of many decades ago for the belief that macroscopic crystals were built up of microscopic particles, called atoms. Because of the regular geometry of the crystal it was reasonable to suppose that the atoms within the crystal must be arranged in an orderly array or lattice. Light cannot be used to photograph the atomic interior of a crystal because the wavelength of light is some two thousand times greater than the interatomic distances involved.
E. D. between two metals is not affected by the insertion of any number of other metals between them, its value always being the diiference in work function between the two extreme metals. D. is very small. Problems 1. Why cannot light be used to photograph the atomic structure of a crystal ? 2. 1 shows that iron, for instance, has two different crystal structures, dependent on the temperature. Can you suggest why this is ? Suggest an experimental arrangement which might be used to show this. 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.