- In modern physics, the double-slit experiment demonstrates that light and matter can satisfy the seemingly incongruous classical definitions for both waves and particles. This ambiguity is considered evidence for the fundamentally probabilistic nature of quantum mechanics. This type of experiment was first performed by Thomas Young in 1801, as a demonstration of the wave behavior of visible light. In 1927, Davisson and Germer and, independently George Paget Thomson and his research student Alexander Reid demonstrated that electrons show the same behavior, which was later extended to atoms and molecules. Thomas Young’s experiment with light was part of classical physics long before the development of quantum mechanics and the concept of wave–particle duality. He believed it demonstrated that Christiaan Huygens’ wave theory of light was correct, and his experiment is sometimes referred to as Young’s experiment or Young’s slits.
- Rhus typhina L. (plants.sc.egov.usda.gov)
Staghorn sumac is a U.S. native, deciduous, large shrub to small tree that can attain a height of 30-35 feet. It has alternate, compound leaves, 16 to 24 inches long. The leaflets are narrowed or rounded at the base and sharply pointed at the tip with finely serrated edges. The leaflets are dark green and smooth above, and pale beneath, except along the midrib.