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  2. Order of magnitude - Wikipedia

    en.wikipedia.org/wiki/Order_of_magnitude

    [contradictory] For example, the number 4 000 000 has a logarithm (in base 10) of 6.602; its order of magnitude is 6. When truncating, a number of this order of magnitude is between 10 6 and 10 7. In a similar example, with the phrase "seven-figure income", the order of magnitude is the number of figures minus one, so it is very easily ...

  3. Orders of magnitude (length) - Wikipedia

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

    Comparison of sizes of semiconductor manufacturing process nodes with some microscopic objects and visible light wavelengths. At this scale, the width of a human hair is about 10 times that of the image. [78] To help compare different orders of magnitude, this section lists lengths between 107 and 10 −6 m (100 nm and 1 μm).

  4. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    For example, 12.5 × 10 −9 m can be read as "twelve-point-five nanometres" and written as 12.5 nm, while its scientific notation equivalent 1.25 × 108 m would likely be read out as "one-point-two-five times ten-to-the-negative-eight metres".

  5. Dynamic range - Wikipedia

    en.wikipedia.org/wiki/Dynamic_range

    Such a difference can exceed 100 dB which represents a factor of 100,000 in amplitude and a factor 10,000,000,000 in power. [4] [5] The dynamic range of human hearing is roughly 140 dB, [6] [7] varying with frequency, [8] from the threshold of hearing (around −9 dB SPL [8] [9] [10] at 3 kHz) to the threshold of pain (from 120 to 140 dB SPL ...

  6. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    The multiplication sign (×), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. [ 1 ] The symbol is also used in botany , in botanical hybrid names .

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  8. Orders of magnitude (energy) - Wikipedia

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

    10 710 7 J Kinetic energy of the armor-piercing round fired by the ISU-152 assault gun [118] [citation needed] 1.1×10 7 J: Recommended food energy intake per day for a moderately active man (2600 food calories) [115] [119] 3.3×10 7 J: Kinetic energy of a 23 lb projectile fired by the Navy's mach 8 railgun. [120] 3.7×10 7 J

  9. Tetration - Wikipedia

    en.wikipedia.org/wiki/Tetration

    Working to the left, use the next a to the left, as the base b, and evaluate the new b^c. 'Descend down the tower' in turn, with the new value for c on the next downward step. Owing in part to some shared terminology and similar notational symbolism , tetration is often confused with closely related functions and expressions.