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Vor 18 Stunden · Matter waves are a central part of the theory of quantum mechanics, being half of wave–particle duality. At all scales where measurements have been practical, matter exhibits wave -like behavior. For example, a beam of electrons can be diffracted just like a beam of light or a water wave.
Vor 18 Stunden · In physics, these standing waves are called "stationary states" or "energy eigenstates"; in chemistry they are called "atomic orbitals" or "molecular orbitals". Superpositions of energy eigenstates change their properties according to the relative phases between the energy levels. The energy eigenstates form a basis: any wave function may be written as a sum over the discrete energy states or ...
Vor 18 Stunden · Etymology The English word sun developed from Old English sunne. Cognates appear in other Germanic languages, including West Frisian sinne, Dutch zon, Low German Sünn, Standard German Sonne, Bavarian Sunna, Old Norse sunna, and Gothic sunnō. All these words stem from Proto-Germanic * sunnōn. This is ultimately related to the word for sun in other branches of the Indo-European language ...
Vor 18 Stunden · Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen. Such effects occur in the context of formation and evolution of galaxies , [1] gravitational lensing , [2] the observable universe 's current structure, mass position in galactic collisions , [3] the motion of galaxies within galaxy clusters , and ...
Vor 18 Stunden · After Mao Zedong 's death, S&T was established as one of the Four Modernizations in 1976. The new leader Deng Xiaoping, and architect of the Chinese economic reform, was a strong promoter of S&T and reversed the policies of the Cultural revolution. The Soviet inspired system was then gradually reformed.
Vor 18 Stunden · Enrico Fermi (1901–1954) The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth. The first aspect of the Fermi paradox is a function of the scale or the large ...
