As with other forms of electromagnetic radiation, X-rays can be described as coupled waves of electric and magnetic fields traveling at the speed of light (about 300,000 km, or 186,000 miles, per second).
Lock Haven, Pennsylvania. The city of Lock Haven is the county seat of Clinton County, in the U.S. state of Pennsylvania. Located near the confluence of the West Branch Susquehanna River and Bald Eagle Creek, it is the principal city of the Lock Haven Micropolitan Statistical Area, itself part of the WilliamsportâLock Haven combined statistical area.
The Central State Normal School, established to train teachers for central Pennsylvania, held its first classes in 1877 at a site overlooking the West Branch Susquehanna River. The small school, with enrollments below 150 until the 1940s, eventually became Lock Haven University of Pennsylvania.