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  2. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.

  3. List of radioactive nuclides by half-life - Wikipedia

    en.wikipedia.org/wiki/List_of_radioactive...

    This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.

  4. Secondary School Mathematics Curriculum Improvement Study

    en.wikipedia.org/wiki/Secondary_School...

    For instance, Leonia High School, which incorporated grades 8–12 (since there was no middle school then), called the program "Math X" for experimental, with individual courses called Math 8X, Math 9X, etc. [13] Hunter College High School used it as the basis for its Extended Honors Program; the school's description stated that the program ...

  5. Half time (physics) - Wikipedia

    en.wikipedia.org/wiki/Half_time_(physics)

    The voltage (v) on the capacitor (C) changes with time as the capacitor is charged or discharged via the resistor (R) In electronics, when a capacitor is charged or discharged via a resistor, the voltage on the capacitor follows the above formula, with the half time approximately equal to 0.69 times the time constant, which is equal to the product of the resistance and the capacitance.

  6. Half-life of knowledge - Wikipedia

    en.wikipedia.org/wiki/Half-life_of_knowledge

    The half-life of knowledge or facts is the amount of time that has to elapse before half of the knowledge or facts in a particular area is superseded or shown to be untrue. These coined terms belong to the field of quantitative analysis of science known as scientometrics .

  7. Specific activity - Wikipedia

    en.wikipedia.org/wiki/Specific_activity

    Specific activity (symbol a) is the activity per unit mass of a radionuclide and is a physical property of that radionuclide. [1] [2] It is usually given in units of becquerel per kilogram (Bq/kg), but another commonly used unit of specific activity is the curie per gram (Ci/g).

  8. Biological half-life - Wikipedia

    en.wikipedia.org/wiki/Biological_half-life

    Absorption half-life 1 h, elimination half-life 12 h. Biological half-life ( elimination half-life , pharmacological half-life ) is the time taken for concentration of a biological substance (such as a medication ) to decrease from its maximum concentration ( C max ) to half of C max in the blood plasma .

  9. Interactive Mathematics Program - Wikipedia

    en.wikipedia.org/wiki/Interactive_Mathematics...

    The Interactive Mathematics Program (IMP) is a four-year, problem-based mathematics curriculum for high schools. It was one of several curricula funded by the National Science Foundation and designed around the 1989 National Council of Teachers of Mathematics (NCTM) standards .

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