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Richard Phillips Feynman (/ ˈ f aɪ n m ə n /; May 11, 1918 – February 15, 1988) was an American theoretical physicist, known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, as well as his work in particle physics for which he proposed the parton model.
Envelope (waves) In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope.
A standing wave, also known as a stationary wave, is a wave whose envelope remains in a constant position. This phenomenon arises as a result of interference between two waves traveling in opposite directions. The sum of two counter-propagating waves (of equal amplitude and frequency) creates a standing wave. Standing waves commonly arise when ...
Social Animals. Just like humans, some animals need to socialize. That means spending time amongst their own breed or species. Or in the case of donkeys and dogs, these animals are totally happy ...
Moiré pattern. A moiré pattern formed by two units of parallel lines, one unit rotated 5° clockwise relative to the other. The fine lines that make up the sky in this image create moiré patterns when shown at some resolutions for the same reason that photographs of televisions exhibit moiré patterns: the lines are not absolutely level ...
Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. [ 1 ] Video was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) systems, which, in turn, were replaced by flat-panel displays of several types.
Salvador Domingo Felipe Jacinto Dalí i Domènech, Marquess of Dalí of Púbol [a] gcYC (11 May 1904 – 23 January 1989), known as Salvador Dalí (/ ˈ d ɑː l i, d ɑː ˈ l iː / DAH-lee, dah-LEE; [1] Catalan: [səlβəˈðo ðəˈli]; Spanish: [salβaˈðoɾ ðaˈli]), [b] was a Spanish surrealist artist renowned for his technical skill, precise draftsmanship, and the striking and bizarre ...
Holography. Holography is a technique that enables a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interferometry. In principle, it is possible to make a hologram for any type of wave.