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  2. Fletcher's checksum - Wikipedia

    en.wikipedia.org/wiki/Fletcher's_checksum

    Fletcher addresses both of these weaknesses by computing a second value along with the simple checksum. This is the modular sum of the values taken by the simple checksum as each block of the data word is added to it.

  3. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

  4. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    العربية; Беларуская; Беларуская (тарашкевіца) Български; Català; Čeština; Deutsch; Eesti; Español; Esperanto

  5. Resistor ladder - Wikipedia

    en.wikipedia.org/wiki/Resistor_ladder

    A 1953 paper "Coding by Feedback Methods" [1] describes "decoding networks" that convert numbers (in any base) represented by voltage sources or current sources connected to resistor networks in a "shunt resistor decoding network" (which in base 2 corresponds to the binary-weighted configuration) or in a "ladder resistor decoding network" (which in base 2 corresponds to R–2R configuration ...

  6. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).

  7. California - Wikipedia

    en.wikipedia.org/wiki/California

    California (/ ˌ k æ l ɪ ˈ f ɔːr n j ə /) is a state in the Western Region of the United States that lies on the Pacific Coast.It borders Oregon to the north, Nevada and Arizona to the east, and shares an international border with the Mexican state of Baja California to the south.

  8. 2024 in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/2024_in_the_United_Kingdom

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  9. North-West Frontier Province - Wikipedia

    en.wikipedia.org/wiki/North-West_Frontier_Province

    The northwestern frontier areas were annexed by the East India Company after the Second Sikh War (1848–49). The territories thenceforth formed a part of Punjab until the province, then known as North West Frontier Province, was created in 1901 from the north-western districts of the Punjab Province. [4]