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decay (time) constant

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  • Time constant — In physics and engineering, the time constant usually denoted by the Greek letter au , (tau), characterizes the frequency response of a first order, linear time invariant (LTI) system. Examples include electrical RC circuits and RL circuits. It… …   Wikipedia

  • RC time constant — In an RC circuit, the value of the time constant (in seconds) is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads), i.e. au = R × C . It is the time required to charge the capacitor, through the… …   Wikipedia

  • decay constant — Physics. the reciprocal of the decay time. Also called decay rate, disintegration constant. [1930 35] * * * ▪ nuclear physics       proportionality between the size of a population of radioactive atoms and the rate at which the population… …   Universalium

  • decay constant — noun : the constant ratio of the number of radioactive atoms disintegrating in any specified short unit interval of time to the total number of atoms of the same kind still intact at the beginning of that interval * * * Physics. the reciprocal of …   Useful english dictionary

  • Decay correct — is a method of adjusting the measurements of radioactive decay obtained at two different time points so that they may be used as a single data set. If a chemical compound is tagged with a radioactive isotope then the amount of radiation released… …   Wikipedia

  • decay constant — n the constant ratio of the number of radioactive atoms disintegrating in any specified short unit interval of time to the total number of atoms of the same kind still intact at the beginning of that interval called also disintegration constant * …   Medical dictionary

  • Decay chain — In nuclear science, the decay chain refers to the radioactive decay of different discrete radioactive decay products as a chained series of transformations. Most radioactive elements do not decay directly to a stable state, but rather undergo a… …   Wikipedia

  • constant — A quantity that, under stated conditions, does not vary with changes in the environment. association c. 1. in experimental immunology, a mathematical expression of hapten antibody interaction : average association c., K = [hapten bound… …   Medical dictionary

  • Time in physics — In physics, the treatment of time is a central issue. It has been treated as a question of geometry. One can measure time and treat it as a geometrical dimension, such as length, and perform mathematical operations on it. It is a scalar quantity… …   Wikipedia

  • Time dilation — This article is about a concept in physics. For the concept in sociology, see time displacement. In the theory of relativity, time dilation is an observed difference of elapsed time between two events as measured by observers either moving… …   Wikipedia

  • Radioactive decay — For particle decay in a more general context, see Particle decay. For more information on hazards of various kinds of radiation from decay, see Ionizing radiation. Radioactive redirects here. For other uses, see Radioactive (disambiguation).… …   Wikipedia

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