electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
German physicist who discovered x-rays and developed roentgenography (1845-1923)
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
a column of light (as from a beacon)
(mathematics) a straight line extending from a point
cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins
a group of nearly parallel lines of electromagnetic radiation
