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In Hindi-Urdu , the vocative case has the same form as the nominative case for all singular nouns except for the singular masculine nouns that terminate in the vowel आ /aː/ ā and for all nouns in their plural forms the vocative case is always distinct from the nominative case. [9] Adjectives in Hindi-Urdu also have a vocative case form.
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In modern grammar, a particle is a function word that must be associated with another word or phrase to impart meaning, i.e., it does not have its own lexical definition. [citation needed] According to this definition, particles are a separate part of speech and are distinct from other classes of function words, such as articles, prepositions, conjunctions and adverbs.
Hindi-Urdu has three noun cases, the nominative, oblique, and vocative cases. The vocative case is now obsolete (but still used in certain regions [citation needed]) and the oblique case doubles as the vocative case. The pronoun cases in Hindi-Urdu are the nominative, ergative, accusative, dative, and two oblique cases.
In the physical sciences, a particle (or corpuscule in older texts) is a small localized object which can be described by several physical or chemical properties, such as volume, density, or mass. [ 1 ] [ 2 ] They vary greatly in size or quantity, from subatomic particles like the electron , to microscopic particles like atoms and molecules ...
In particle accelerators the beamline is usually housed in a tunnel and/or underground, cased inside a concrete housing for shielding purposes. The beamline is usually a cylindrical metal pipe, typically called a beam pipe, and/or a drift tube, evacuated to a high vacuum so there are few gas molecules in the path for the beam of accelerated particles to hit, which otherwise could scatter them ...
The development of the Standard Model of particle physics by Sheldon Glashow's discovery in 1960 of a way to combine the electromagnetic and weak interactions. [6] In 1967 Steven Weinberg [ 7 ] and Abdus Salam [ 8 ] incorporated the Higgs mechanism [ 9 ] [ 10 ] [ 11 ] into Glashow's electroweak theory , giving it its modern form.
the mass–energy equivalence formula which gives the energy in terms of the momentum and the rest mass of a particle. The equation for the mass shell is also often written in terms of the four-momentum ; in Einstein notation with metric signature (+,−,−,−) and units where the speed of light c = 1 {\displaystyle c=1} , as p μ p μ ≡ p ...