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  2. Bohr radius - Wikipedia

    en.wikipedia.org/wiki/Bohr_radius

    In Schrödinger's quantum-mechanical theory of the hydrogen atom, the Bohr radius is the value of the radial coordinate for which the radial probability density of the electron position is highest. The expected value of the radial distance of the electron, by contrast, is ⁠ 3 2 a 0 {\displaystyle {\tfrac {3}{2}}a_{0}} ⁠ .

  3. Accuracy class - Wikipedia

    en.wikipedia.org/wiki/Accuracy_class

    Class 0.5 is an ANSI C12.20 accuracy class for electric meters with absolute accuracy better than ± 0.5% of the nominal full scale reading. [ 1 ] Typically, a class specifies accuracy at a number of points, with the absolute accuracy at lower values being better than the nominal "percentage of full scale" accuracy.

  4. Effect size - Wikipedia

    en.wikipedia.org/wiki/Effect_size

    In statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that quantity. It can refer to the value of a statistic calculated from a sample of data, the value of one parameter for a hypothetical population, or to the equation that operationalizes how statistics or parameters lead to the effect size ...

  5. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    11 meters – approximate width of a doubles tennis court; 15 meterswidth of a standard FIBA basketball court; 15.24 meterswidth of an NBA basketball court (50 feet) 18.44 meters – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches) [126]

  6. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    In such applications it is useful to use a unit for target size that is a thousandth of the unit for range, for instance by using the metric units millimeters for target size and meters for range. This coincides with the definition of the milliradian where the arc length is defined as ⁠ 1 / 1,000 ⁠ of the radius.

  7. Full width at half maximum - Wikipedia

    en.wikipedia.org/wiki/Full_width_at_half_maximum

    In a distribution, full width at half maximum (FWHM) is the difference between the two values of the independent variable at which the dependent variable is equal to half of its maximum value. In other words, it is the width of a spectrum curve measured between those points on the y -axis which are half the maximum amplitude.

  8. List of electronic component packaging types - Wikipedia

    en.wikipedia.org/wiki/List_of_electronic...

    The codes given in the chart below usually tell the length and width of the components in tenths of millimeters or hundredths of inches. For example, a metric 2520 component is 2.5 mm by 2.0 mm which corresponds roughly to 0.10 inches by 0.08 inches (hence, imperial size is 1008).

  9. List of radio telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_radio_telescopes

    8 mirrors with diameter of 16 meters. Square is 1000 sq. meters. RT-16 Ventspils International Radio Astronomy Center, Irbene, Latvia 16-meter diameter antenna RT-16 [37] KAIRA: Kilpisjärvi, Enontekiö, Finland 30 m × 50 m, 768-element phased array and a 34 m diameter, 48-element phased array Metsähovi Radio Observatory