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quantum mechanics
quantum mechanics or quantum theory, branch of mathematical physics that deals with the emission and absorption of energy by matter and with the motion of material particles. Because it holds that energy and matter exist in tiny, discrete amounts, quantum mechanics is particularly applicable to ELEMENTARY PARTICLES and the interactions between them. ... According to the quantum theory, energy is emitted and absorbed in a small packet, called a quantum (pl. ... The quantum theory thus proposes a dual nature for both waves and particles, with one aspect predominating in some situations and the other predominating in other situations. Quantum mechanics is needed to explain many properties of matter, such as the temperature dependence of the SPECIFIC HEAT of solids, as well as when very small quantities of matter or energy are involved, as in the interaction of elementary particles and fields, but the theory of RELATIVITY assumes importance in the special situation where very large speeds are involved. ... (The results of classical physics approximate those of quantum mechanics for large scale events and those of relativity when ordinary speeds are involved.) Quantum theory was developed principally over a period of thirty years. ... Niels BOHR used the quantum theory in 1913 to explain both atomic structure and atomic spectra, showing the connection between the energy levels of an atoms electrons and the frequencies of
light given off and absorbed by the atom. Quantum mechanics, the final mathematical formulation of the quantum theory, was developed during the 1920s.
Approximate Word count = 1192
Approximate Pages = 4.8
(250 words per page double spaced)
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