Some Shapes
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Echinus (detail) Jean Baptiste Lamarck. Tableau Encyclopédique et Méthodique des Trois Regnes de la Nature, Paris 1791-1798. Photograph by D Dunlop. |
A particle described by its wavelength $\lambda$ and orbital radius $\, R$ may be classified by shape.
Shape | Definition |
a point | $R = \lambda = 0$ |
a line segment | $\lambda > R = 0$ |
a plane section | $R > \lambda = 0$ |
a plate | $R \gg \lambda > 0$ |
a rod | $\lambda \gg R > 0$ |
a cylinder | $\lambda \sim R > 0$ |
page revision: 131, last edited: 06 Mar 2016 19:47