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The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.
1806 = pronic number, [90] product of first four terms of Sylvester's sequence, primary pseudoperfect number, [461] only number for which n equals the denominator of the nth Bernoulli number, [462] Schröder number [463] 1807 = fifth term of Sylvester's sequence [464] 1808 = maximal number of regions the plane is divided into by drawing 43 ...
Nuclear fusion–fission hybrid (hybrid nuclear power) is a proposed means of generating power by use of a combination of nuclear fusion and fission processes. The concept dates to the 1950s, and was briefly advocated by Hans Bethe during the 1970s, but largely remained unexplored until a revival of interest in 2009, due to the delays in the ...
For power contracts made in the year 2014, the average price of wind power fell to 2.5¢/kWh. [40] The capacity factor is the ratio of power actually produced divided by the nameplate capacity of the turbines. The overall average capacity factor for wind generation in the US increased from 31.7% in 2008, to 32.3% in 2013.
The estimated number of foibe victims is disputed, varying from hundreds to thousands, [30] according to some sources 11,000 [16] [17] or 20,000. [10] Many foibe victim lists are deficient, with repeated names, victims of fascist or German forces, victims killed in combat, or who were still alive or died in completely different circumstances ...
This is a list of the most populous municipal corporations of the United States.As defined by the United States Census Bureau, an incorporated place includes cities, towns, villages, boroughs, and municipalities.
By comparison, the total mass of all the stars in the Milky Way is estimated to be between 4.6 × 10 10 M ☉ [146] and 6.43 × 10 10 M ☉. [ 141 ] In addition to the stars, there is also interstellar gas, comprising 90% hydrogen and 10% helium by mass, [ 147 ] [ unreliable source? ] with two thirds of the hydrogen found in the atomic form and ...
The most stable isotope is 222 Rn (half-life 3.82 days), which is a decay product of 226 Ra, the latter being itself a decay product of 238 U. [40] A trace amount of the (highly unstable) isotope 218 Rn (half-life about 35 milliseconds ) is also among the daughters of 222 Rn.