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  2. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]

  3. Seismic magnitude scales - Wikipedia

    en.wikipedia.org/wiki/Seismic_magnitude_scales

    K values are logarithmic, similar to Richter-style magnitudes, but have a different scaling and zero point. K values in the range of 12 to 15 correspond approximately to M 4.5 to 6. [59] M(K), M (K), or possibly M K indicates a magnitude M calculated from an energy class K. [60]

  4. Time signature - Wikipedia

    en.wikipedia.org/wiki/Time_signature

    Paul Desmond's jazz composition "Take Five", in 5 4 time, was one of a number of irregular-meter compositions that The Dave Brubeck Quartet played. They played other compositions in 11 4 ("Eleven Four"), 7 4 ("Unsquare Dance"), and 9 8 ("Blue Rondo à la Turk"), expressed as 2+2+2+3 8. "Blue Rondo à la Turk" is an example of a signature that ...

  5. Beaufort scale - Wikipedia

    en.wikipedia.org/wiki/Beaufort_scale

    46 knots 4–7 mph 611 km/h 1.6–3.3 m/s 1–2 ft 0.3–0.6 m Small wavelets still short but more pronounced; crests have a glassy appearance but do not break Wind felt on face; leaves rustle; wind vane moved by wind 3 Gentle breeze 7–10 knots 8–12 mph 12–19 km/h 3.45.4 m/s 2–4 ft 0.6–1.2 m

  6. Display aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Display_aspect_ratio

    The display aspect ratio (DAR) is the aspect ratio of a display device and so the proportional relationship between the physical width and the height of the display. It is expressed as two numbers separated by a colon (x: y), where x corresponds to the width and y to the height. Common aspect ratios for displays, past and present, include 5:4 ...

  7. List of WLAN channels - Wikipedia

    en.wikipedia.org/wiki/List_of_WLAN_channels

    Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.

  8. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    9+3⁄4 × 13+3⁄4. 7∶5. The most common paper sizes used for commercial and industrial printing in Colombia are based upon a size referred to as pliego that is ISO B1 (707 mm × 1000 mm) cut to full decimetres. Smaller sizes are derived by halving as usual and just get a vulgar fraction prefix: 1⁄2 pliego and 1⁄4 pliego.

  9. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    Common print sizes in the United States (in inches) include 4×6 (1.5), 5×7 (1.4), 4×5 and 8×10 (1.25), and 11×14 (1.27); large format cameras typically use one of these aspect ratios. Medium-format cameras typically have format designated by nominal sizes in centimeters (6×6, 6×7, 6×9, 6×4.5), but these numbers should not be ...