PHY 2020 Chapter Notes - Chapter 12: Max Von Laue, Photographic Film, Radiography
Document Summary
The german physicist max von laue discovered that a beam of x-rays directed upon a crystal is diffracted, or separated, into a characteristic pattern. X-ray diffraction patterns on photographic film show that crystals are neat mosaics of atoms sited on regular lattices, like 3-dimensional chessboards or children"s jungle gyms with acid. These metal crystals can be seen when a metal surface is etched, or cleaned, Noncrystalline solid are said to be amorphous. In amorphous state, atoms and molecules in a solid are distributed randomly. In many amorphous solids, the particles have some freedom to wander: this is evident in the elasticity of rubber and the tendency of glass to flow when subjected to stress over long periods of time. Atomic bonding: mention the four principal types of bonding in solids: ionic, covalent, metallic, and van der waals, the last being the weakest.
