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  2. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at ⁠ c / 1.5 ⁠ ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

  3. Free-space path loss - Wikipedia

    en.wikipedia.org/wiki/Free-space_path_loss

    Free-space path loss. In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

  4. Surface gravity - Wikipedia

    en.wikipedia.org/wiki/Surface_gravity

    Surface gravity is measured in units of acceleration, which, in the SI system, are meters per second squared. It may also be expressed as a multiple of the Earth 's standard surface gravity, which is equal to [1] g = 9.806 65 m/s2. In astrophysics, the surface gravity may be expressed as log g, which is obtained by first expressing the gravity ...

  5. Orders of magnitude (energy) - Wikipedia

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

    Total solar radiation received from the Sun by 1 square meter at the altitude of Earth's orbit per second (solar constant) [93] 2.3×10 3 J: Energy to vaporize 1 g of water into steam [94] 3×10 3 J: Lorentz force can crusher pinch [95] 3.4×10 3 J: Kinetic energy of world-record men's hammer throw (7.26 kg [96] thrown at 30.7 m/s [97] in 1986 ...

  6. Metre per second - Wikipedia

    en.wikipedia.org/wiki/Metre_per_second

    3.2808. The metre per second is the unit of both speed (a scalar quantity) and velocity (a vector quantity, which has direction and magnitude) in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second. According to the definition of metre, [1] 1 m/s is exactly of the speed ...

  7. Graph paper - Wikipedia

    en.wikipedia.org/wiki/Graph_paper

    Quad paper, sometimes referred to as quadrille paper from French quadrillé, 'large square', [5] is a common form of graph paper with a sparse grid printed in light blue or gray and right to the edge of the paper. In the U.S. and Canada, it often has two, four or five squares per inch for work not needing too much detail. In Europe, it usually ...

  8. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    In the physical sciences, the wavenumber (or wave number), also known as repetency, [1] is the spatial frequency of a wave, measured in cycles per unit distance (ordinary wavenumber) or radians per unit distance (angular wavenumber). [2][3][4] It is analogous to temporal frequency, which is defined as the number of wave cycles per unit time ...

  9. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    In order to compensate for this gain, a GPS clock's frequency needs to be slowed by the fraction: 5.307 × 10 −10 – 8.349 × 10 −11 = 4.472 × 10 −10. This fraction is subtracted from 1 and multiplied by the pre-adjusted clock frequency of 10.23 MHz: (1 – 4.472 × 10 −10) × 10.23 = 10.22999999543

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