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Tempo de Planck. Origem: Wikipédia, a enciclopédia livre.

Tempo de Planck

Em física, o tempo de Planck, (tP), é a unidade de tempo no sistema de unidades naturais, conhecidos como Unidades de Planck. Neste intervalo de tempo a luz viaja, no vácuo, uma distância que define a unidade natural conhecida por comprimento de Planck.[1] A unidade recebe esse nome em referência a Max Planck, o primeiro a propô-la. O tempo de Planck é definido como: Comprimento de Planck. Planck epoch. In physical cosmology, the Planck epoch or Planck era is the earliest period of time in the history of the universe, from zero to approximately 10−43 seconds (Planck time).

Planck epoch

It is believed that, due to the extraordinarily small scale of the universe at that time, quantum effects of gravity dominated physical interactions. During this period, approximately 13.79 billion years ago, gravitation is believed to have been as strong as the other fundamental forces, and all the forces may have been unified. Inconceivably hot and dense, the state of the universe during the Planck epoch was unstable. As it expanded and cooled, the familiar manifestations of the fundamental forces arose through a process known as symmetry breaking. Theoretical ideas[edit] Experiments exploring this time[edit] See also[edit] [edit] References[edit] Untitled. Grand unification epoch.

The grand unification epoch ended at approximately 10−36 seconds after the Big Bang.

Grand unification epoch

At this point several key events took place. The strong force separated from the other fundamental forces. Untitled. Electroweak epoch. In physical cosmology the electroweak epoch was the period in the evolution of the early universe when the temperature of the universe was high enough to merge electromagnetism and the weak interaction into a single electroweak interaction (> 100 GeV).

Electroweak epoch

The electroweak epoch began when the strong force separated from the electroweak interaction. Some cosmologists place this event at the start of the inflationary epoch, approximately 10−36 seconds after the Big Bang.[1][2][3] Others place it at approximately 10−32 seconds after the Big Bang when the potential energy of the inflaton field that had driven the inflation of the universe during the inflationary epoch was released, filling the universe with a dense, hot quark–gluon plasma.[4] Particle interactions in this phase were energetic enough to create large numbers of exotic particles, including W and Z bosons and Higgs bosons. See also[edit] References[edit] Untitled. Como Funcionam as Células Nervosas. Como Funcionam as Células Nervosas.

Como Funcionam as Células Nervosas

Parte II O Potencial de Ação Silvia Helena Cardoso, Luciana Christante de Mello, MSc e Renato M.E. Sabbatini, PhD Animações e ilustrações: André Malavazzi Eletricidade é um processo natural em nosso organismo e está envolvida na função específica de certas células especiais no cérebro e nos músculos estriados e lisos. Cada padrão de luz, som, calor, dor, cada piscar de olhos, estalar de dedos, cada pensamento, se traduz em uma sequência de pulsos elétricos. Como isso acontece? As células nervosas possuem propriedades similares às outras células em muitos aspectos: elas se alimentam, respiram, passam por processos de difusão e osmose em suas membranas, etc., mas diferem em um aspecto importante: elas processam informação.

Os neurônios não existem isoladamente: eles também se conectam uns aos outros formando as chamadas cadeias neuronais, as quais transmitem informações a outros neurônios ou músculos. O Impulso Nervoso. File:Descartes-reflex.JPG. Photosynthesis. Schematic of photosynthesis in plants.

Photosynthesis

The carbohydrates produced are stored in or used by the plant. Overall equation for the type of photosynthesis that occurs in plants Composite image showing the global distribution of photosynthesis, including both oceanic phytoplankton and terrestrial vegetation. Dark red and blue-green indicate regions of high photosynthetic activity in ocean and land respectively. File:Photosynthesis.gif. Segundo. Origem: Wikipédia, a enciclopédia livre.

Segundo

Segundo (símbolo: s, que deve ser grafado em letra minúscula, com exceção de inícios de frase, também como símbolo " ) é uma unidade de medida angular usada também para medir intervalos tempo. Originalmente, o segundo deveria ser o tempo que o sol a pino leva para percorrer a distância de 1/86400 da circunferência terrestre, ou seja, 462,962 metros na linha do equador.

File:Cesium.jpg. Proton. The proton is a subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron.

Proton

Protons and neutrons, each with mass approximately one atomic mass unit, are collectively referred to as "nucleons". One or more protons are present in the nucleus of an atom. The number of protons in the nucleus is referred to as its atomic number. Since each element has a unique number of protons, each element has its own unique atomic number. The word proton is Greek for "first", and this name was given to the hydrogen nucleus by Ernest Rutherford in 1920. File:Cesium.jpg. Minute. By contrast to the hour the minute (and the second) has not a clear historical background.

Minute

International System of Units. For a topical guide to this subject, see Outline of the metric system.

International System of Units

The seven base units in the International System of Units The system was published in 1960 as the result of an initiative that started in 1948. Photon. Nomenclature[edit] In 1900, Max Planck was working on black-body radiation and suggested that the energy in electromagnetic waves could only be released in "packets" of energy. In his 1901 article [4] in Annalen der Physik he called these packets "energy elements". The word quanta (singular quantum) was used even before 1900 to mean particles or amounts of different quantities, including electricity. Later, in 1905, Albert Einstein went further by suggesting that electromagnetic waves could only exist in these discrete wave-packets.[5] He called such a wave-packet the light quantum (German: das Lichtquant).

Bacteria. Bacteria ( Most bacteria have not been characterized, and only about half of the phyla of bacteria have species that can be grown in the laboratory.[11] The study of bacteria is known as bacteriology, a branch of microbiology. Etymology Origin and early evolution. File:Binary Fission 2.svg. Cancel Edit Delete Preview revert Text of the note (may include Wiki markup) Could not save your note (edit conflict or other problem). Please copy the text in the edit box below and insert it manually by editing this page.

Upon submitting the note will be published multi-licensed under the terms of the CC-BY-SA-3.0 license and of the GFDL, versions 1.2, 1.3, or any later version. Hora. Origem: Wikipédia, a enciclopédia livre. A hora (símbolo: h) é uma unidade de medida de tempo que tem por base a velocidade de rotação e as dimensões da Terra. Na convenção moderna uma hora é equivalente a 60 minutos ou 3 600 segundos. Isso é aproximadamente 1/24 (um vinte e quatro avos) de um dia da Terra. A hora foi originalmente definida no Egito como 1/24 (um vinte e quatro avos) de um dia, baseado no sistema de numeração duodecimal. Mitose. Origem: Wikipédia, a enciclopédia livre. Etapas da mitose: I ao III prófase, IV metáfase, V e VI anáfase, VII e VIII telófase.

File:Major events in mitosis.svg. Cancel Edit Delete Preview revert Text of the note (may include Wiki markup) Could not save your note (edit conflict or other problem). Please copy the text in the edit box below and insert it manually by editing this page. Dia. Origem: Wikipédia, a enciclopédia livre. File:Rotating earth axial tiles to orbit.gif.

Month. A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. Ano. Origem: Wikipédia, a enciclopédia livre. Um ano corresponde ao intervalo aproximado de tempo que a Terra demora para completar uma volta em torno do Sol.[1] Os anos têm uma duração de 365 dias, 5 horas, 48 minutos e 48 segundos aproximadamente. Mas como não pode haver todos os anos um 366º dia com as cerca de 6 horas que sobram, no calendário gregoriano realiza-se, a cada quatro anos, um ajuste no calendário e adiciona-se mais um dia ao ano, sendo que este ano se denomina bissexto.[1] Existem outras correcções menores, que dão lugar a excepções à regra anterior.

CD-ROM - Atlas de Energia Elétrica do Brasil - 2ª edição. 3.2 – Radiação Solar. Solar cycle. "The current prediction for Sunspot Cycle 24 gives a smoothed sunspot number maximum of about 69 in the late Summer of 2013. The smoothed sunspot number reached 68.9 in August 2013 so the official maximum will be at least this high. The smoothed sunspot number has been rising again towards this second peak over the last five months and has now surpassed the level of the first peak (66.9 in February 2012). Many cycles are double peaked but this is the first in which the second peak in sunspot number was larger than the first. We are currently over five years into Cycle 24. File:The Solar Cycle XRay hi.jpg.

Brasileiro nasce com esperança de vida de 74 anos e 29 dias, diz IBGE - notícias em Brasil. Números divulgados pelo Instituto Brasileiro de Geografia e Estatística (IBGE) nesta quinta-feira (29) mostram que, em 2011, a esperança de vida ao nascer no Brasil era de 74 anos e 29 dias - um aumento de 3 meses e 22 dias em relação a 2010, quando a expectativa de vida do brasileiro era de 73 anos e 277 dias. Em relação a 2000, o indicador fechou 2011 com um aumento de cerca de 3,65 anos – são 3 anos, 7 meses e 24 dias a mais do que a expectativa naquele ano (70 anos e 182 dias). Carbon-14. Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons. Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples.

Carbon-14 was discovered on 27 February 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley. Untitled. File:Hoploscaphites ammonite.jpg. NASA - Sun-Earth Day - Technology Through Time - #50 Ancient Sunlight. The 8-minute travel time to Earth by sunlight hides a thousand-year journey that actually began in the core. Sunrises are seen with light created thousands of years ago in the core of the sun. Sunlight is produced through nuclear reactions in the sun's core. Originally born as energetic gamma rays, after billions of collisions with matter, this radiation reaches the surface and escapes into space. How old is sunlight by the time it reaches the surface? Most textbooks say that it takes light between 100,000 years and 50 million years to escape. Once a photon of light is born, it travels at a speed of 300,000 km/sec until it collides with a charged particle and is diverted in another direction.

Photon. Sol. Origem: Wikipédia, a enciclopédia livre. O Sol (do latim sol, solis[12] ) é a estrela central do Sistema Solar. NASA - Sun-Earth Day - Technology Through Time - #50 Ancient Sunlight. Homo sapiens. File:Christopher Columbus.PNG. File:Diagram of the human heart (cropped).svg. File:Digestive system diagram en.svg. File:Human brain NIH.png. File:Gene.png. Big Bang. Untitled. Star. File:Witness the Birth of a Star.jpg. Pangaea. File:Pangaea continents.svg. File:Pangea animation 03.gif. Galaxy formation and evolution. Untitled. History of the Earth. Stromatolite. File:Stromatolites.jpg. Age of the Earth. Sistema Solar.

Ficheiro:Solarnebula.jpg. Como nasceram as primeiras estrelas no Universo » O Universo - Eternos Aprendizes. Universo e SS (resumo) Solar System Exploration. Ficheiro:Sun Life.png. IOK-1. Press Release - Cosmic Archeology Uncovers the Universe’s Dark Ages - Subaru Telescope. Universo. May 2011. This 3-D Map Will Make Teaching the Universe a Whole Lot Cooler. Electron. File:Cyclotron motion wider view.jpg. Proton. File:Quark structure proton.svg.