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All matter can exhibit wave-like behaviour. For example a beam of electrons can be diffracted just like a beam of light or a water wave. Matter waves are a central part of the theory of quantum mechanics, being an example of wave–particle duality. The concept that matter behaves like a wave is also referred to as the de Broglie hypothesis () due to having been proposed by Louis de Broglie in 1924.〔Feynman, R.; ''QED the Strange Theory of Light and matter'', Penguin 1990 Edition, page 84.〕 Matter waves are often referred to as de Broglie waves. The de Broglie wavelength is the wavelength, , associated with a massive particle and is related to its momentum, , through the Planck constant, : : Wave-like behaviour of matter was first experimentally demonstrated in the Davisson–Germer experiment using electrons, and it has also been confirmed for other elementary particles, neutral atoms and even molecules. The wave-like behaviour of matter is crucial to the modern theory of atomic structure and particle physics. ==Historical context== At the end of the 19th century, light was thought to consist of waves of electromagnetic fields which propagated according to Maxwell’s equations, while matter was thought to consist of localized particles (See history of wave and particle viewpoints). In 1900, this division was exposed to doubt, when, investigating the theory of black body thermal radiation, Max Planck proposed that light is emitted in discrete quanta of energy. It was thoroughly challenged in 1905. Extending Planck's investigation in several ways, including its connection with the photoelectric effect, Albert Einstein proposed that light is also propagated and absorbed in quanta. Light quanta are now called photons. These quanta would have an energy given by the Planck–Einstein relation: : and a momentum : where (lowercase Greek letter nu) and (lowercase Greek letter lambda) denote the frequency and wavelength of the light, the speed of light, and Planck’s constant.〔Einstein, A. (1917). Zur Quantentheorie der Strahlung, ''Physicalische Zeitschrift'' 18: 121–128. Translated in 〕 In the modern convention, frequency is symbolized by ''f'' as is done in the rest of this article. Einstein’s postulate was confirmed experimentally by Robert Millikan and Arthur Compton over the next two decades. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Matter wave」の詳細全文を読む スポンサード リンク
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