Eye Surgery The argon fluoride (ArF) laser used in some refractive eye surgeries emits electromagnetic radiation of 193.3 nm wavelength. What is the frequency of the ArF lasers radiation? What is the energy of a single quantum of the radiation? (nm) 400 434 nm 486 nm 656 nm 410 nm 450 500 550 Hydrogens Atomic Emission Spectrum 600 650 700 750 Figure 5.22
Chemistry Vocabulary Chapter One Mixture: physical combination of two or more pure substances. There is no fixed ratio for the included substances. The substances can be physically taken apart. Solid: do not conform to their container, highly organized. Liquids: takes the shape of its container, moves a lot more. Gases: molecules move freely, they fill the whole container. Pure Substance: has a fixed composition that has not been changed Compounds: made up of atoms of two or more different elements. There is a fixed composition of atoms and molecules (ex. Amount of oxygen in H2O), and they must be chemically taken apart. Atoms: the smallest unit of an element that can exist as a stable, independent entity. You will never be able to see an atom. Elements: made up of atoms of one
