X rays, a form of electromagnetic radiation, have a wavelength ranging from 10 to 0.01 nanometers (billionths of a meter), which corresponds to frequencies ranging from 30 petahertz to 30 exahertz (30 × 10~(15) to 30 × 10~(18) hertz) and energies ranging from 120 electronvolts to 120 kiloelectronvolts. Their discoverer, Wilhelm Conrad Roeentgen, called them x rays, meaning an unknown type of radiation.
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