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Glossary of Physics Terms beginning with letter R
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R noun The eighteenth letter of the Appendix:Roman script, English alphabet, preceded by Q and followed by S. abbreviation (context, US politics) Republican (film certification) restricted reverse right (as opposed to left) (context, handbells) ring (context, baseball, cricket) The statistic reporting the number of runs scored by a player Thursday rad noun (metrology) A non-SI unit of absorbed dose of radiation, equal to 0.01 gray. adjective (slang) excellent, short for radical radiant noun A point source from which radiation is emitted. (astronomy) The apparent origin, in the night sky, of a meteor shower. adjective Radiate, Radiating light and/or heat. Emitted as radiation. Bright, glowing or filled with light. radiate verb (radiat, ing) To extend, send or spread out from a center like radii. (transitive) To emit rays or waves. The stove radiates heat. (intransitive) To come out or proceed in rays or waves. The heat radiates from a stove. (transitive) To illuminate. To expose to ionizing radiation, such as by radiography. (transitive) To manifest oneself in a glowing manner. (context, ecology, intransitive) to spread into new habitats, migrate. adjective radiating from a center. surrounded by rays, such as the head of a saint in a religious picture. (botany) having parts radiating from the center, such as the petals in many flowers. (biology) having radial symmetry, such as a seastar. radiation noun The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat. The process of radiating waves or particles. The transfer of energy via radiation (as opposed to convection or conduction) Radioactive energy radiation pressure noun (physics) the pressure exerted by electromagnetic radiation on an object on which it impinges, as a consequence of its momentum radiative adjective (physics) of, relating to, or occuring through radiation radio noun (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves. (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound. (countable) A device that can transmit radio signal. verb To send a message by radio ''I think the boat is sinking, we'd better radio for help. Usage note: Used for small radio transmitters carried by people, ships, etc, not for regular radio broadcasting to large audiences. radioactive adjective Exhibiting radioactivity. radioactivity noun Spontaneous emission of radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. radioluminescence noun luminescence produced by bombardment with ionizing radiation radionuclide noun (physics) a radioactive nuclide range noun Line or series of mountains. Large fuel-burning stove. Selection, array. Eg: A range of cars. Area used for shooting, artillery, etc. An area of open, often unfenced, grazing land. (mathematics) The set of values (points) which a function can obtain. (statistics) The length of the smallest interval which contains all the data. It is calculated by subtracting the smallest observations from the greatest. The distance to a target, or to the subject of discussion. We could see the ship at a range of five miles. (sports) (baseball) The defensive area that a player can cover. Jones has good for a big man. (music) Compass - The scale of all the tones a voice or an instrument can produce. (ecology) The geographical area or zone where a species is normally naturally found. verb (ranges, ranging, ranged) (intransitive) (followed by over) To travel over (an area, etc) with a particular purpose. (intransitive) (mathematics, computing; followed by over) Of a variable, to be able to take any of the values in a specified range. The variable x ranges over all real values from 0 to 10. (transitive) classify 1924: ARISTOTLE. Metaphysics. Translated by W. D. Ross. Nashotah, Wisconsin, USA: The Classical Library, 2001. Available at: <http://www.classicallibrary.org/aristotle/metaphysics/>. Book 1, Part 5. : they seem, however, to the elements under the head of matter; rarefaction noun a reduction in the density of a material, especially that of a fluid rarefy verb to rarefy To make rare, thin, porous, or less dense To expand or enlarge without adding any new portion of matter to. reactance noun (symbol X) (context, physics, electric) opposition to the change in flow of current in an alternating current circuit, due to inductance and capacitance; the imaginary part of the impedance reaction noun An action or statement in response to a stimulus or other event The announcement of the verdict brought a violent . You were in the coutroom. What is your ? When I last tried to eat strawberries I had a terrible allergic . (chemistry) A transformation in which one or more substances is converted into another by combination or decomposition In this , the acid and base will neutralize each other, producing a salt. recoil noun (context, firearms) The amount of energy transmitted back to the shooter from a firearm which has fired. Recoil is a function of the weight of the weapon, the weight of the projectile, and the speed at which it leaves the muzzle. verb (recoils, recoiling, recoiled) To pull back, especially in disgust, horror or astonishment. He recoiled* in disgust when he saw the mess.* Red noun A Communist adjective Communist the Army regenerate verb (regenerat, ing) (transitive) To construct or create anew, especially in an improved manner (transitive) To revitalize (context, transitive, biology) To replace lost or damaged tissue (intransitive) To become reconstructed (intransitive) To undergo a spiritual rebirth relative density noun (science)A measure of the density of a material. The ratio of the density of a substance to the density of water at the same temperature. It is dimensionless and therefor has no units. Typical relative densities (approximate) : ethanol: 0.79 : water: 1.00 : iron: 7.8 : gold: 19.3 relativistic mass noun (physics) the increased mass of an object moving at relativistic speed relative to an observer relativity noun the state of being relative to something else. (physics) the principle (due to Galileo) that the laws of physics should be the same for all observers in uniform motion. (physics) either of the two principles of special relativity or general relativity (Einstein, Albert Einstein). repulsion noun the act of repelling or the condition of being repelled an extreme dislike of something, or hostility to something (physics) the repulsive force acting between bodies of the same electric charge or magnetic polarity repulsive adjective tending to rouse aversion or to repulse (context, physics) having the capacity to repel residence time noun (hydrology) The average time a particular molecule of water will remain in a body of water. restitution noun a process of compensation for losses. rest mass noun (physics) the mass of a body when it is not moving relative to an observer reverberation noun A violent oscillation or vibration The discomfort caused by the bat's surprised Tommy. An echo, or a series of overlapping echos The that followed Marylin's shout filled the cavern. An evolving series of effects resulting from a particular event; a repercussion Reverberations from the Vietnam war affect our society to this day. rheology noun (physics) The branch of physics that studies the deformation and flow of matter. roentgenoscope noun a fluoroscope Rydberg proper noun a surname of Swedish origin, derived from ryd, woodland clearing + berg, mountain w:Johannes Rydberg, Johannes Rydberg Swedish physicist a lunar impact crater that is located on the far side of the Moon

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