a unit of mass used in particle physics. Mass and energy are related by Einstein's famous equation, E = mc 2. The constant c is the speed of light, 299.79 x 10 6 m/sec. An energy of 1 electronvolt is therefore equivalent to a mass of about 1.782 662 x 10-33 gram, or about 1.073 544 x 10-9 atomic mass unit.
Yulee is a census-designated place (CDP) in Nassau County, Florida, United States. The population was 11,491 at the 2010 census.
Interstate 40 passes through the county. Lake Greenlee, a rectangular lake enclosed by a four-sided levee, Green and East lakes, backwater lakes, and Maddox Bay offer excellent fishing. The Cache River runs through the county with Dagmar Wildlife Management Area providing hunting for several species.