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.
Roll is an unincorporated community in central Yuma County, Arizona, United States. It is part of the Yuma Metropolitan Statistical Area. Named for early settler John H. Roll, it lies along the lower Gila River, between the Yuma Proving Ground and the Barry M. Goldwater Air Force Range. Local roads connect Roll to Interstate 8, east of the city of Yuma, the county seat of Yuma County. Its elevation is 262 feet (80 m). Although Roll is unincorporated, it has a post office. Roll has the ZIP Code of 85347; in the 2000 census, the population of the 85347 ZCTA was 1,235.