What are some differences in physical and chemical properties of metals and nonmetals?
  explains the mathematics behind this and discusses Angstroms. In 1927, Davisson and Germer proved that particles (specifically electrons) have wave properties. Professor Harman explains the constructive and destructive interfence properties of waves to explain their experiment using crystals. Lastly, Professor Harman uses a guitar to explain standing waves, which produce quantized prequencies. This helps to explain that, because electrons also have quantized frequencies, they can only be …
