"Angstrom unit" Quotes from Famous Books
... radiation is in the "ultraviolet" region of the solar spectrum, invisible to the eye at short wavelengths (under 3,000 A). (An angstrom unit—A—is an exceedingly short unit of length—10 billionths of a centimeter, or about 4 billionths of an inch.) Unlike X-rays, ultraviolet photons are not "hard" enough to ionize atoms, but pack enough energy to break down the chemical bonds ... — Worldwide Effects of Nuclear War: Some Perspectives • United States Arms Control and Disarmament Agency |