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  2. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Morse code. Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

  3. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    Where s is the s-plane variable, ω is angular frequency and j is the imaginary unit.. Chebyshev filters. Sometimes other ratios are more convenient than the 3 dB point. For instance, in the case of the Chebyshev filter it is usual to define the cutoff frequency as the point after the last peak in the frequency response at which the level has fallen to the design value of the passband ripple.

  4. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    A light-year, alternatively spelled light year ( ly ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km ( Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light-year is the distance that ...

  5. Railgun - Wikipedia

    en.wikipedia.org/wiki/Railgun

    Test firing at the United States Naval Surface Warfare Center Dahlgren Division in January 2008 [1] [clarification needed] A railgun or rail gun is a linear motor device, typically designed as a weapon, that uses electromagnetic force to launch high- velocity projectiles. The projectile normally does not contain explosives, instead relying on ...

  6. Empire of Japan - Wikipedia

    en.wikipedia.org/wiki/Empire_of_Japan

    The Empire of Japan, [c] also referred to as the Japanese Empire, Imperial Japan, or simply Japan, was the Japanese nation-state [d] that existed from the Meiji Restoration in 1868 until the enactment of the reformed Constitution of Japan in 1947. [8] From 29 August 1910 to 2 September 1945, the Empire of Japan included present-day Japan, Kuril ...

  7. Venus - Wikipedia

    en.wikipedia.org/wiki/Venus

    The density at the surface is 65 kg/m 3 (4.1 lb/cu ft), 6.5% that of water or 50 times as dense as Earth's atmosphere at 293 K (20 °C; 68 °F) at sea level. The CO 2 -rich atmosphere generates the strongest greenhouse effect in the Solar System, creating surface temperatures of at least 735 K (462 °C; 864 °F).

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