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  2. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio φ and its negative reciprocal −φ −1 are the two roots of the quadratic polynomial x 2 − x − 1. The golden ratio's negative −φ and reciprocal φ −1 are the two roots of the quadratic polynomial x 2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial

  3. Reflectance - Wikipedia

    en.wikipedia.org/wiki/Reflectance

    Spectral reflectance curves for aluminium (Al), silver (Ag), and gold (Au) metal mirrors at normal incidence. The reflectance of the surface of a material is its effectiveness in reflecting radiant energy. It is the fraction of incident electromagnetic power that is reflected at the boundary.

  4. Metallic mean - Wikipedia

    en.wikipedia.org/wiki/Metallic_mean

    The metallic mean (also metallic ratio, metallic constant, or noble means[1]) of a natural number n is a positive real number, denoted here that satisfies the following equivalent characterizations: Metallic means are generalizations of the golden ratio ( ) and silver ratio ( ), and share some of their interesting properties.

  5. Gold is having a moment — but silver is poised for its own ...

    www.aol.com/finance/gold-having-moment-silver...

    First, silver has slightly outperformed gold this year, but gold prices are still elevated with respect to silver on a historical basis when looking at the so-called gold-silver ratio. When the ...

  6. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    The SI unit of electrical resistivity is the ohm - metre (Ω⋅m). [1][2][3] For example, if a 1 m3 solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m. Electrical conductivity (or specific conductance) is the reciprocal of ...

  7. Silver as an investment - Wikipedia

    en.wikipedia.org/wiki/Silver_as_an_investment

    The gold/silver price ratio is often analyzed by traders, investors, and buyers. [8] The gold/silver ratio is the oldest continuously tracked exchange rate in history. [9] In Roman times, the price ratio was set at 12 (or 12.5) to 1. [10] In 1792, the gold/silver price ratio was fixed by law in the United States at 15:1, [11] which meant that ...

  8. Gold standard - Wikipedia

    en.wikipedia.org/wiki/Gold_standard

    The return of gold could only be possible by reducing the dollar's gold equivalence, and in the Coinage Act of 1834 the gold–silver ratio was increased to 16.0 (ratio finalized in 1837 to 15.99 when the fine gold content of the $10 eagle was set at 232.2 grains or 15.0463 g).

  9. 80 Plus - Wikipedia

    en.wikipedia.org/wiki/80_Plus

    80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.

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