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  2. Becquerel - Wikipedia

    en.wikipedia.org/wiki/Becquerel

    1 Bq = 1 s −1. A special name was introduced for the reciprocal second (s −1) to represent radioactivity to avoid potentially dangerous mistakes with prefixes.For example, 1 μs −1 would mean 10 6 disintegrations per second: (10 −6 s) −1 = 10 6 s −1, [4] whereas 1 μBq would mean 1 disintegration per 1 million seconds.

  3. Natural logarithm of 2 - Wikipedia

    en.wikipedia.org/wiki/Natural_logarithm_of_2

    In a third layer, the logarithms of rational numbers r = ⁠ a / b ⁠ are computed with ln(r) = ln(a) − ln(b), and logarithms of roots via ln n √ c = ⁠ 1 / n ⁠ ln(c).. The logarithm of 2 is useful in the sense that the powers of 2 are rather densely distributed; finding powers 2 i close to powers b j of other numbers b is comparatively easy, and series representations of ln(b) are ...

  4. Isotopes of oxygen - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_oxygen

    There are three known stable isotopes of oxygen (8 O): 16 O, 17 O, and 18 O. Radioactive isotopes ranging from 11 O to 28 O have also been characterized, all short-lived. The longest-lived radioisotope is 15

  5. Specific strength - Wikipedia

    en.wikipedia.org/wiki/Specific_strength

    One Yuri equals 1 Pa⋅m 3 /kg or 1 N⋅m/kg, which is the breaking/yielding force per linear density of the cable under tension. [ 42 ] [ 43 ] A functional Earth space elevator would require a tether of 30–80 megaYuri (corresponding to 3100–8200 km of breaking length).

  6. Fission product yield - Wikipedia

    en.wikipedia.org/wiki/Fission_product_yield

    Fission product yields by mass for thermal neutron fission of U-235, Pu-239, a combination of the two typical of current nuclear power reactors, and U-233 used in the thorium fuel cycle

  7. List of hyperbolic comets - Wikipedia

    en.wikipedia.org/wiki/List_of_hyperbolic_comets

    This is a list of parabolic and hyperbolic comets in the Solar System.Many of these comets may come from the Oort cloud, or perhaps even have interstellar origin. The Oort Cloud is not gravitationally attracted enough to the Sun to form into a fairly thin disk, like the inner Solar System.

  8. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    Equal to Modern equivalent Description pous πούς: 0.095 m 2 (1.02 sq ft) square foot hexapodēs ἑξαπόδης: 36 podes 3.42 m 2 (36.8 sq ft) square six-foot akaina ἄκαινα: 100 podes 9.50 m 2 (102.3 sq ft) rod hēmiektos ἡμίεκτος: 833 + 1 ⁄ 3 podes 79.2 m 2 (853 sq ft) half a sixth hektos ἕκτος: 1,666 + 2 ⁄ 3 podes

  9. Mesh (scale) - Wikipedia

    en.wikipedia.org/wiki/Mesh_(scale)

    Mesh is a measurement of particle size often used in determining the particle-size distribution of a granular material.For example, a sample from a truckload of peanuts may be placed atop a mesh with 5 mm openings.