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radio compass
(Encyclopedia) radio compass: see radio range.ball-and-socket joint
(Encyclopedia) ball-and-socket joint, in engineering, mechanical connection used between parts that must be allowed some relative angular motion in nearly all directions. As the name implies, the…Radio Free Europe
(Encyclopedia) Radio Free Europe (RFE), broadcasting organization established in 1950 with the stated mission of promoting democratic values and institutions. Its original purpose was to broadcast…Radio Frequencies (table)
(Encyclopedia) Radio Frequencies Frequency (kHz) Name Abbr. 10–30 Very low VLF 30–300 Low LF 300–3,000 Medium MF 3,000–30,000 High HF 30,000–300,000 Very high VHF 300,000–3,000,000 Ultra…radio frequency
(Encyclopedia) radio frequency, range of electromagnetic waves with a frequency or wavelength suitable for communication uses. Some of these waves serve as carriers of the lower-frequency audio waves…radio-frequency identification
(Encyclopedia) radio-frequency identification (RFID), a technology that uses radio waves to transmit data and uniquely identify an animal, person, or thing. An RFID system typically consists of a tag…radiography
(Encyclopedia) radiography: see X ray.radioimmunoassay
(Encyclopedia) radioimmunoassay (RIA), highly sensitive laboratory technique used to measure minute amounts of substances including antigens, hormones, and drugs present in the body. The substance or…radioisotope
(Encyclopedia) radioisotope: see radioactive isotope.radiological weapon
(Encyclopedia) radiological weapon: see radiation weapon.Trending
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