to be strong on physics
91Zeeman effect — Physics, Optics. the dividing of a spectral line or lines as a result of placing a radiation source in a magnetic field. The division consists of three equally spaced lines (normal Zeeman effect) in systems for which the spin quantum number is… …
92charge conjugation — Physics. the mathematical operation of replacing every elementary particle by its antiparticle. Symbol: C * * * ▪ physics in particle physics, an operation that replaces particles with antiparticles (antiparticle) (and vice versa) in… …
93quantum electrodynamics — Physics. the quantum field theory that deals with the electromagnetic field and its interaction with electrons and positrons. Abbr.: QED [1925 30] * * * ▪ physics quantum field theory of the interactions of charged (electric charge)… …
94W particle — Physics. either of two types of charged intermediate vector bosons, one having a positive charge and the other a negative charge. Symbols: W+, W [1970 75; appar. for weak] * * * Electrically charged subatomic particle that transmits the weak… …
95nuclear magnetic resonance — Physics. the selective absorption of electromagnetic radiation by an atomic nucleus in the presence of a strong, static, magnetic field: used in research and in medicine to monitor tissue metabolism and to distinguish between normal and abnormal… …
96weak force — Physics. a force between elementary particles that causes certain processes that take place with low probability, as radioactive beta decay and collisions between neutrinos and other particles. Also called weak interaction force. Cf. weak… …
97electron paramagnetic resonance — ▪ physics also called electron spin resonance (ESR) selective absorption of weak radio frequency electromagnetic radiation (in the microwave region) by unpaired electrons in the atomic structure of certain materials that simultaneously… …
98Feynman diagram — Physics. a network of lines that represents a series of emissions and absorptions of elementary particles by other elementary particles, from which the probability of the series can be calculated. Also called Feynman graph. [1965 70; named after… …
99GUT — Physics. grand unification theory. * * * abbreviation of Grand Unified Theory, also called Grand Unification Theory, or Grand Unified Field Theory, in particle physics, any of various theoretical attempts to unify the strong, weak, and… …
100gravitational radiation — ▪ physics the transmission of variations in the gravitational field as waves. According to general relativity (relativity), the curvature of space time is determined by the distribution of masses, while the motion of masses is determined by the… …
