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An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force resulting from their opposite charges. It is an electrically neutral quasiparticle regarded as an elementary excitation primarily in condensed matter, such as insulators, semiconductors, some metals, and in some liquids.
The term antonym (and the related antonymy) is commonly taken to be synonymous with opposite, but antonym also has other more restricted meanings. Graded (or gradable) antonyms are word pairs whose meanings are opposite and which lie on a continuous spectrum (hot, cold).
Adjectives can be modified by a preceding adverb or adverb phrase, as in very warm, truly imposing, more than a little excited. Some can also be preceded by a noun or quantitative phrase, as in fat-free, two-meter-long. Complements following the adjective may include: prepositional phrases: proud of him, angry at the screen, keen on breeding toads;
A self-excited shunt-wound DC generator is shown on the left, and a magneto DC generator with permanent field magnets is shown on the right. The shunt-wound generator output varies with the current draw, while the magneto output is steady regardless of load variations. A separately-excited DC generator with bipolar field magnets.
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In Spanish dar (basic meaning "to give"), when applied to lessons or subjects, can mean "to teach", "to take classes" or "to recite", depending on the context. [22] Similarly with the French verb apprendre, which usually means "to learn" but may refer to the action of teaching someone. [23] Dutch leren and Afrikaans leer can mean "to teach" or ...
free body diagram frequency frequency modulation free fall Any motion of a body where its own weight is the only force acting upon it. freezing point The temperature at which a substance changes state from liquid to solid. friction function fundamental forces. Also called fundamental interactions. fundamental frequency fundamental theorem of ...
Apathy, also referred to as indifference, is a lack of feeling, emotion, interest, or concern about something.It is a state of indifference, or the suppression of emotions such as concern, excitement, motivation, or passion.