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Decibel. The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel ( B ). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12 ).
Yandex LLC (Russian: Яндекс, romanized: Yandeks, IPA: [ˈjandəks]) is a Russian multinational technology company [5] providing Internet -related products and services, including an Internet search engine called Yandex Search, launched in 1997, information services, e-commerce, transportation, maps and navigation, mobile applications, and online advertising. [6] [2] Yandex Holding ...
X-ray wavelengths are shorter than those of ultraviolet rays and longer than those of gamma rays. There is no universally accepted, strict definition of the bounds of the X-ray band. Roughly, X-rays have a wavelength ranging from 10 nanometers to 10 picometers, corresponding to frequencies in the range of 30 petahertz to 30 exahertz ( 3 × 1016 Hz to 3 × 1019 Hz) and photon energies in the ...
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The United Nations ( UN) is a diplomatic and political [2] international organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and serve as a centre for harmonizing the actions of nations. [3] It is the world's largest international ...
Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H2, sometimes called dihydrogen, [11] but more commonly called hydrogen gas, molecular hydrogen or simply hydrogen. It is colorless, odorless, tasteless, [12] non-toxic, and ...