einstein

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El einstein (símbolo E) es una unidad obsoleta con dos definiciones conflictivas. Se definió originalmente como la energía en un mol de fotones (6.022×1023 fotones). Dado que la energía es inversamente proporcional a la longitud de onda, la unidad depende de la frecuencia. Esta unidad no forma parte del Sistema Internacional de Unidades (SI) y es redundante con el julio. Si aún estuviera en uso, a partir de la revisión de 2019 del SI, su valor estaría relacionado con la frecuencia de la radiación electromagnética por1 einstein = 1 mol × NA h f = 1 mol × 6.02214076×1023 mol−1 × 6.62607015×10−34 J⋅s × f = 3.9903127128934321×10−10 J⋅s × f,

Resumen

The einstein (symbol E) is an obsolete unit with two conflicting definitions. It was originally defined as the energy in one mole of photons ( photons). Because energy is inversely proportional to wavelength, the unit is frequency dependent. This unit is not part of the International System of Units (SI) and is redundant with the joule. If it were still in use, as of the 2019 redefinition of the SI base units, its value would be related to the frequency of the electromagnetic radiation by 1 einstein = 1 mol × = 1 mol × × × = × , donde es la constante de Avogadro, es la constante de Planck, y es la frecuencia. Sometime later, the unit was used differently in studies of photosynthesis to mean one mole of photons, rather than the energy in one mole of photons. As such, photosynthetically active radiation (PAR) was formerly often reported in microeinsteins per second per square meter (μE m−2 s−1). This usage is also not part of the SI and when used this way it is redundant with the mole. Since the unit does not have a standard definition and is not part of the SI system, it has long been considered obsolete. The same information about photosynthetically active radiation can be conveyed using the SI convention by stating something such as "The photon flux was 1500 μmol m−2 s−1".

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“Everything should be made as simple as possible, but not simpler.”
— Repeated throughout his life (with variants); see: Quote Investigator
“I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.”
— Interview with Rabindranath Tagore (14 April 1930), published in The Religion of Man (1930) by Rabindranath Tagore, p. 222, and in The Tagore Reader (1971) edited by Amiya Chakravarty
“I am very smart. But not as strong-hearted as all the workers on earth for he toils endlessly and does it all to feed his family while I do it merely for solving an impossible puzzle.”
— Letter to his cousin Richard Einstein (October 1947)
“I advocate world government because I am convinced that there is no other possible way of eliminating the most terrible danger in which man has ever found himself. The objective of avoiding total destruction must have priority over any other objective.”
— Ch. 27 A reply to the Soviet scientists (1948)
“It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. I do not believe in a personal God and I have never denied this but have expressed it clearly. If something is in me which can be called religious then it is the unbounded admiration for the structure of the world so far as our science can reveal it.”
— Letter to an atheist (24 March 1954), p. 43
“The mere formulation of a problem is far more often essential than its solution, which may be merely a matter of mathematical or experimental skill. To raise new questions, new possibilities, to regard old problems from a new angle requires creative imagination and makes real advances in science”
— http://umich.edu/~scps/html/01chap/html/summary.htm

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